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Mọi người giúp mình với, mình đang cần gấp, xin cảm ơn ạ I / chọn từ thích hợp 1. Churches, temples and pagodas are places........ ( friendship / worship / warship /amusement) 2. Her performance made a deep impression............ ( for / from/ with / on) all of her teachers 3. The ............( area / climate / population / capital) of this island is about 123,000 sq km 4. The..........( currency / speech / language / compulsion) 5. The examination will be held...
Đọc tiếp

Mọi người giúp mình với, mình đang cần gấp, xin cảm ơn ạ

I / chọn từ thích hợp

1. Churches, temples and pagodas are places........ ( friendship / worship / warship /amusement)

2. Her performance made a deep impression............ ( for / from/ with / on) all of her teachers

3. The ............( area / climate / population / capital) of this island is about 123,000 sq km

4. The..........( currency / speech / language / compulsion)

5. The examination will be held ..........(on / in / at/ since) the end of this month

6. We are going to visit Chicago, .............( knows /which knows / known / which known) as the Windy city

7. We really enjoy the peaceful.......... ( atmosphere / impression / attitude / dependence) of this village

8. We have to learn math at school. It is a...........(compulsory / religious / optional / natural) subject

9. .................( because of / in addition / according to / besides) islam, there are other religions in Malaysia

10. We are visit Singapore, it is our first time ............(foreign / abroad / outside / outdoor)

1
21 tháng 7 2017

Mọi người giúp mình với, mình đang cần gấp, xin cảm ơn ạ

I / chọn từ thích hợp

1. Churches, temples and pagodas are places........ ( friendship / worship / warship /amusement)

2. Her performance made a deep impression............ ( for / from/ with / on) all of her teachers

3. The ............( area / climate / population / capital) of this island is about 123,000 sq km

4. The..........( currency / speech / language / compulsion) (vế sau đâu??)

5. The examination will be held ..........(on / in / at/ since) the end of this month

6. We are going to visit Chicago, .............( knows /which knows / known / which known) as the Windy city

7. We really enjoy the peaceful.......... ( atmosphere / impression / attitude / dependence) of this village

8. We have to learn math at school. It is a...........(compulsory / religious / optional / natural) subject

9. .................( because of / in addition / according to / besides) islam, there are other religions in Malaysia

10. We are visit Singapore, it is our first time ............(foreign / abroad / outside / outdoor)

I. VOCABULARY 1. Churches, temples and pagodas are places of _________________      A. friendship              B. worship               C. warship                   D. scholarship2. Visitors can really enjoy the peaceful ___________________in Vietnam.      A.    impression           B. expression             C. religion               D. atmosphere3. The United States has a _______________ of around 260 million.      A. population             B. separation              C. addition               ...
Đọc tiếp

I. VOCABULARY

 

1. Churches, temples and pagodas are places of _________________

      A. friendship              B. worship               C. warship                   D. scholarship

2. Visitors can really enjoy the peaceful ___________________in Vietnam.

      A.    impression           B. expression             C. religion               D. atmosphere

3. The United States has a _______________ of around 260 million.

      A. population             B. separation              C. addition                D. introduction

4. Maria and Van write to each other  twice a month. They are ___________________. 

      A. pen friends             B. pen names        C. pen pals                  D. A & C are correct

5. They have ____________________for nearly two years, but this was their first meeting.

      A. talked                       B. written                    C. corresponded   D. spoken

6. The English 9 textbook _____________________ten Units.

      A. comprises              B.  consists                        C.  divides                   D. depends

7. Most people in Malaysia practice Islam. It is the country’s ________________religion.

      A. compulsory               B. optional                      C. national                  D. official

8. Mathematics and Literature are                                           for children in this country.

      A. religious                    B. option                     C. adding                       D. compulsory

9. What terrible weather we have! We wish the sky ____________________clear.

      A. is                                B. be                             C. will be                      D. were

10. Maryam and Lan ______________________pen pals for over two years.

      A. are                          B. were                            C. have been    D. will be

11. Did that foreigner use to _______________ here?

      A. live                          B. living                    C. lived                      D. be lived

12. I wish I ______________ fly.

      A. can                         B. will                        C. could                    D. should    

 13. She ____________________to her friend when I came.

     A. wrote                      B. was writing            C. is writing             D. written

14. It rains again! I wish I ____________________an umbrella now. 

      A. had                             B. have                          C. have had                 D. had had

15. He _________________for the company since he __________________school.

      A.   works/leaves          B. worked/left                  C. has worked/left       D. had worked/left

16. My close friend and I live far from each other, but we always ___________________.

      A. get on                        B. keep on                 C. keep in touch   D. keep off

17. The poem consists ______________ two parts.  

      A. on                           B. for                         C. of                          D. to

 18. Hanoi and Kuala Lumpur are the same ____________________some ways. 

       A. in                                B. on                            C. at                              D. by

19. I was very impressed                                 the efficiency of the staff.

      A. on                           B. by                                C. to                          D. in

20.  We have lived in this town                                    1998.

      A. for                         B. since                      C. ago                       D. in

 

II . STRESS

 

                A                      B                                 C                           D

1.        modern            comprise                    friendliness           peaceful

2.        religion            Hinduism                    optional                 primary

3.        mausoleum     correspond                 separation             secondary

4.        language         consist                        separate               literature

5.        currency          capital                         museum               region

 

III. FILL IN BLANKS

 

 1.   Malaysia is a country in South East Asia. It is a member of the Association of South East Asia Nations .It consists (1) _______ the Malay Peninsula and Sarawak and Sabah on the Island Borneo. It is (2) _______ into regions, known as West Malaysia and East Malaysia. It has a tropical (3) ______. It is the world’s biggest producer of palm oil, and it (4)_____ rubber, tin, and gas. In addition to Islam, the country‘s official (5) ______, there are Buddhism, Hinduism, Christianity .Malaysian people speak Bahasa Malaysia as a mother (6)______. It is the language of (7)______ in all secondary schools  English, Chinese, and Tamil are also (8) ________spoken in this country.

1.     A. in                      B. at                          C. for                          D. of

2.     A. divided              B. comprised            C. impressed              D. corresponded

3.     A. weather            B. climate                  C. regilion                   D. soil

4.     A. exports             B. imports                  C. accounts                D. separates

5.     A. region               B. religion                  C. territory                  D. federation

6.     A. tongue              B. mosque                 C. decision                 D.  impression

7.     A. attraction          B. instruction              C. association            D. production

8.     A. quickly              B. widely                    C. simply                    D. easily

 

2.  Lan and Razali (1) _____once every two weeks. They are from different countries but they have been (2) ______for over two years. They hadn’t seen each other until Razali (3) ______Lan in Hanoi last week. Lan took her pen pal to many places of (4) ______in Hanoi such as Ho Chi Minh Mausoleum, The Temple of Literature, etc. Razali was really _______(5) by the beauty of Hanoi and by the friendliness of its people. One day, the two girls went to the mosque on Hang Luoc Street. There, Razali (6) _______while Lan was wandering around the mosque.When they said goodbye to each other (7) ________ the end of the vacation, they promised that they would keep in (8) _____by mailing.

 

        1. A. send                        B. speak                      C. correspond             D. write

        2. A. classmates             B. pen pals                  C. roommates             D. friend

        3. A. came                      B. visited                     C. arrived                    D. got

        4. A. interested                B. interesting               C. interestingly           D. interest

        5. A. impressed               B. interested                C. thought                   D. liked

        6. A. talked                      B. prayed                    C. sang                        D. sat

        7. A. on                            B. in                             C. at                            D. to

        8. A. touch                       B. hand                        C. letters                      D. with

 

IV. PRONUNCIATION

                  A                            B                        C                      D

1.    Buddhism           compulsory           puppet              summer

2.    climate                tropical                 official               comprise

3.    prayed                divided                 arrived               seemed

4.   school                  Liverpool              took                   moon

       5.   separate             depend                  impress             region

 

V. USE “ I WISH…..”

1. It’s a pity I can’t go to the party.

> ……………………………………………………………………………………………

2. I don’t like being so fat.

> ……………………………………………………………………………………………

3. I’m sorry I don’t have enough money now.

> ……………………………………………………………………………………………

4. Lan isn’t here and I want to see her.

> ……………………………………………………………………………………………

5. I live very far from the supermarket.

> ……………………………………………………………………………………………

6. Don’t shout all the time here.

> ……………………………………………………………………………………………

7. You draw very badly.

>………………………………………………………………………………………………

8. Unfortunately, the weather isn’t better today.

> ………………………………………………………………………………………………

1
27 tháng 7 2021

I. VOCABULARY

1. Churches, temples and pagodas are places of _________________

      A. friendship              B. worship               C. warship                   D. scholarship

2. Visitors can really enjoy the peaceful ___________________in Vietnam.

      A.    impression           B. expression             C. religion               D. atmosphere

3. The United States has a _______________ of around 260 million.

      A. population             B. separation              C. addition                D. introduction

4. Maria and Van write to each other  twice a month. They are ___________________. 

      A. pen friends             B. pen names        C. pen pals                  D. A & C are correct

5. They have ____________________for nearly two years, but this was their first meeting.

      A. talked                       B. written                    C. corresponded   D. spoken

6. The English 9 textbook _____________________ten Units.

      A. comprises              B.  consists                        C.  divides                   D. depends

7. Most people in Malaysia practice Islam. It is the country’s ________________religion.

      A. compulsory               B. optional                      C. national                  D. official

8. Mathematics and Literature are                                           for children in this country.

      A. religious                    B. option                     C. adding                       D. compulsory

9. What terrible weather we have! We wish the sky ____________________clear.

      A. is                                B. be                             C. will be                      D. were

10. Maryam and Lan ______________________pen pals for over two years.

      A. are                          B. were                            C. have been    D. will be

11. Did that foreigner use to _______________ here?

      A. live                          B. living                    C. lived                      D. be lived

12. I wish I ______________ fly.

      A. can                         B. will                        C. could                    D. should    

 13. She ____________________to her friend when I came.

     A. wrote                      B. was writing            C. is writing             D. written

14. It rains again! I wish I ____________________an umbrella now. 

      A. had                             B. have                          C. have had                 D. had had

15. He _________________for the company since he __________________school.

      A.   works/leaves          B. worked/left                  C. has worked/left       D. had worked/left

16. My close friend and I live far from each other, but we always ___________________.

      A. get on                        B. keep on                 C. keep in touch   D. keep off

17. The poem consists ______________ two parts.  

      A. on                           B. for                         C. of                          D. to

 18. Hanoi and Kuala Lumpur are the same ____________________some ways. 

       A. in                                B. on                            C. at                              D. by

19. I was very impressed                                 the efficiency of the staff.

      A. on                           B. by                                C. to                          D. in

20.  We have lived in this town                                    1998.

      A. for                         B. since                      C. ago                       D. in

 

II . STRESS

 

                A                      B                                 C                           D

1.        modern            comprise                    friendliness           peaceful

2.        religion            Hinduism                    optional                 primary

3.        mausoleum     correspond                 separation             secondary

4.        language         consist                        separate               literature

5.        currency          capital                         museum               region

 

III. FILL IN BLANKS

 

 1.   Malaysia is a country in South East Asia. It is a member of the Association of South East Asia Nations .It consists (1) _______ the Malay Peninsula and Sarawak and Sabah on the Island Borneo. It is (2) _______ into regions, known as West Malaysia and East Malaysia. It has a tropical (3) ______. It is the world’s biggest producer of palm oil, and it (4)_____ rubber, tin, and gas. In addition to Islam, the country‘s official (5) ______, there are Buddhism, Hinduism, Christianity .Malaysian people speak Bahasa Malaysia as a mother (6)______. It is the language of (7)______ in all secondary schools  English, Chinese, and Tamil are also (8) ________spoken in this country.

1.     A. in                      B. at                          C. for                          D. of

2.     A. divided              B. comprised            C. impressed              D. corresponded

3.     A. weather            B. climate                  C. regilion                   D. soil

4.     A. exports             B. imports                  C. accounts                D. separates

5.     A. region               B. religion                  C. territory                  D. federation

6.     A. tongue              B. mosque                 C. decision                 D.  impression

7.     A. attraction          B. instruction              C. association            D. production

8.     A. quickly              B. widely                    C. simply                    D. easily

 

2.  Lan and Razali (1) _____once every two weeks. They are from different countries but they have been (2) ______for over two years. They hadn’t seen each other until Razali (3) ______Lan in Hanoi last week. Lan took her pen pal to many places of (4) ______in Hanoi such as Ho Chi Minh Mausoleum, The Temple of Literature, etc. Razali was really _______(5) by the beauty of Hanoi and by the friendliness of its people. One day, the two girls went to the mosque on Hang Luoc Street. There, Razali (6) _______while Lan was wandering around the mosque.When they said goodbye to each other (7) ________ the end of the vacation, they promised that they would keep in (8) _____by mailing.

 

        1. A. send                        B. speak                      C. correspond             D. write

        2. A. classmates             B. pen pals                  C. roommates             D. friend

        3. A. came                      B. visited                     C. arrived                    D. got

        4. A. interested                B. interesting               C. interestingly           D. interest

        5. A. impressed               B. interested                C. thought                   D. liked

        6. A. talked                      B. prayed                    C. sang                        D. sat

        7. A. on                            B. in                             C. at                            D. to

        8. A. touch                       B. hand                        C. letters                      D. with

 

IV. PRONUNCIATION

                  A                            B                        C                      D

1.    Buddhism           compulsory           puppet              summer

2.    climate                tropical                 official               comprise

3.    prayed                divided                 arrived               seemed

4.   school                  Liverpool              took                   moon

       5.   separate             depend                  impress             region

 

V. USE “ I WISH…..”

1. It’s a pity I can’t go to the party.

> …I wish I could go to the party.…………………………………………………………………………………………

2. I don’t like being so fat.

> ………I wish I weren't so fat……………………………………………………………………………………

3. I’m sorry I don’t have enough money now.

> ……I wish I had enough money now.………………………………………………………………………………………

4. Lan isn’t here and I want to see her.

> ………I wish Lan were here……………………………………………………………………………………

5. I live very far from the supermarket.

> ………I wish I lived near the supermarket.……………………………………………………………………………………

6. Don’t shout all the time here.

> …………I wish you didn't  shout all the time here.…………………………………………………………………………………

7. You draw very badly.

>……I wish you drew well…………………………………………………………………………………………

8. Unfortunately, the weather isn’t better today.

> ………I wish the weather were better today………………………………………………………………………………………

1. Churches, temples and pagodas are places of _________________      A. friendship              B. worship                C. warship              D. scholarship2. Visitors can really enjoy the peaceful ___________________in Vietnam.      A. impression           B. expression             C. religion                D. atmosphere3. Since 1960 jeans have become more and more ________________ with students.      A. common                B. popular                  C. famous               D....
Đọc tiếp

1. Churches, temples and pagodas are places of _________________

      A. friendship              B. worship                C. warship              D. scholarship

2. Visitors can really enjoy the peaceful ___________________in Vietnam.

      A. impression           B. expression             C. religion                D. atmosphere

3. Since 1960 jeans have become more and more ________________ with students.

      A. common                B. popular                  C. famous               D. familiar

4. The Singaporean ________________is Singapore dollars.

      A. currency                B. capital                    C. language            D. climate

5. The United States has a _______________ of around 260 million.

      A. population             B. separation              C. addition              D. introduction

6. The word jeans comes from a kind of _______________ that was made in Europe.

      A. iron                        B. glasses                  C. wood                  D. material

7. They have added these _______________ to the ao dai.

      A. symbols                 B. fahion                    C. clothing              D. patterns

8.  For a long time, the ao dai has been the _______________of poems, novels and songs.

  A. uniform                 B. tradition                  C. subject               D. symbol

9.  What do you do to _____________________your friends when they fail?

       A. encourage            B. embroider              C. wear                   D. call

10.  Today, jeans are ______________________all over the world.  

      A. famous                  B. popular                  C. traditional           D. wide

11.  In the 1980s, jeans finally became high _____________________ clothing.

      A. fashion                  B. fashionable            C. fashionably         D. unfashionable

12. Maria and Van write to each other  twice a month. They are ___________________. 

      A. pen friends             B. pen names           C. pen pals             D. A & C are correct

13. They have ____________________for nearly two year, but this was their first meeting.

      A. talked                     B. written                    C. corresponded     D. spoken

14. Nguyen Du is considered one of the greatest Vietnamese _________________

      A. poems                   B. poetry                   C. poets                  D. poetics

15. Their houses are ______________ situated near the beach. They can go swimming every day.

      A. convenience          B. inconvenient          C. conveniently       D. inconveniently

16. The English 9 textbook _____________________ten Units.

      A. comprises              B. consists                C.  divides               D. depends

17. The new uniform is very _____________________for the kids.

      A. traditional               B. official                   C. compulsory         D. convenient

18. Many designers took ______________________from Vietnam’s ethnic minorities.

      A. friendliness            B. impression             C. inspiration           D. fashion

19. Nowadays, Japanese wear kimonos on holidays and on special ________________.

      A. education               B. tradition                 C. occasions            D. fashions

20. Many schools have changed the styles of their uniform to make it more comfortable and ____.

      A. unfashionable         B. unique                    C. economic           D. inconvenient

1
5 tháng 8 2021

1. Churches, temples and pagodas are places of _________________

      A. friendship              B. worship                C. warship              D. scholarship

2. Visitors can really enjoy the peaceful ___________________in Vietnam.

      A. impression           B. expression             C. religion                D. atmosphere

3. Since 1960 jeans have become more and more ________________ with students.

      A. common                B. popular                  C. famous               D. familiar

4. The Singaporean ________________is Singapore dollars.

      A. currency                B. capital                    C. language            D. climate

5. The United States has a _______________ of around 260 million.

      A. population             B. separation              C. addition              D. introduction

6. The word jeans comes from a kind of _______________ that was made in Europe.

      A. iron                        B. glasses                  C. wood                  D. material

7. They have added these _______________ to the ao dai.

      A. symbols                 B. fahion                    C. clothing              D. patterns

8.  For a long time, the ao dai has been the _______________of poems, novels and songs.

  A. uniform                 B. tradition                  C. subject               D. symbol

9.  What do you do to _____________________your friends when they fail?

       A. encourage            B. embroider              C. wear                   D. call

10.  Today, jeans are ______________________all over the world.  

      A. famous                  B. popular                  C. traditional           D. wide

11.  In the 1980s, jeans finally became high _____________________ clothing.

      A. fashion                  B. fashionable            C. fashionably         D. unfashionable

12. Maria and Van write to each other  twice a month. They are ___________________. 

      A. pen friends             B. pen names           C. pen pals             D. A & C are correct

13. They have ____________________for nearly two year, but this was their first meeting.

      A. talked                     B. written                    C. corresponded     D. spoken

14. Nguyen Du is considered one of the greatest Vietnamese _________________

      A. poems                   B. poetry                   C. poets                  D. poetics

15. Their houses are ______________ situated near the beach. They can go swimming every day.

      A. convenience          B. inconvenient          C. conveniently       D. inconveniently

16. The English 9 textbook _____________________ten Units.

      A. comprises              B. consists                C.  divides               D. depends

17. The new uniform is very _____________________for the kids.

      A. traditional               B. official                   C. compulsory         D. convenient

18. Many designers took ______________________from Vietnam’s ethnic minorities.

      A. friendliness            B. impression             C. inspiration           D. fashion

19. Nowadays, Japanese wear kimonos on holidays and on special ________________.

      A. education               B. tradition                 C. occasions            D. fashions

20. Many schools have changed the styles of their uniform to make it more comfortable and ____.

      A. unfashionable         B. unique                    C. economic           D. inconvenient

10 tháng 10 2021

1 C

2 B

3 A

4 B

5 A

10 tháng 10 2021

1. B

2. C

3. A

4. B

5. A

PTHH: \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

Ta có: \(\left\{{}\begin{matrix}m_{H_2SO_4}=588\cdot5\%=29,4\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\\n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,3}{3}\) \(\Rightarrow\) Al2O3 còn dư

\(\Rightarrow n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)=n_{Al_2O_3\left(dư\right)}\)

\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1\cdot342}{20,4+588-0,1\cdot102}\cdot100\%\approx5,72\%\)

12 tháng 4 2021

Bạn tham khảo nha:

1.

Tiếng ve râm ran trong bụi cây báo hiệu mùa hè đã tới. Lòng em cũng háo hức khôn nguôi. Có lẽ bởi vì mùa hè cũng là mùa của những bông hoa phượng đỏ rực-loài hoa của tuổi học trò cũng là loài hoa mà em yêu thích nhất.

Trong tán phượng xanh mát, lấp ló những chùm hoa phượng nở rộ. Mới đầu hè, cây phượng mới chỉ xuất hiện vài chấm đỏ điểm trên nền xanh non tràn trề sức sống. Thế nhưng chỉ một vài ngày sau, cả tán phượng tràn ngập màu đỏ tươi, che lấp đi cả màu xanh của lá. Nhìn từ xa, cây phượng như một nàng thiếu nữ yêu kiều, khoác lên mình chiếc váy đỏ rực rỡ. Hoa phượng thường mọc thành từng chùm, từng chùm đung đưa trong gió. Mới đầu, hoa phượng chỉ là một nụ hoa nhỏ màu xanh non. Qua một vài ngày, những cánh màu xanh nở ra tạo thành đài hoa, nở đan xen là những cánh hoa màu đỏ tươi, mỏng manh, mềm mại. Hoa phượng có năm cánh, đặc biệt có một cánh cái màu đỏ xen lẫn với những xọc trắng, ở phần gân hoa lại có màu vàng nhạt làm cho bông hoa phượng càng thêm rực rỡ. Nhụy phượng cũng có màu đỏ, khá dài và mảnh, ở đầu có một túi phấn nhỏ xíu đựng đầy những mật ngọt quyến rũ ong bướm tới hút mật. Những bông phượng mọc đan xen với nụ hoa tạo thành những chùm hoa vô cùng đẹp đẽ. Dưới cái nắng vàng rực rỡ của mùa hè, hoa phượng dường như càng rực rỡ. Cái màu đỏ tinh khôi, là kết tinh của nắng, của gió, của mùa hè sôi động. Đến khi cái nắng của mùa hè không còn rực rỡ nữa, những cánh phượng cũng buồn bã lìa cành. Những cánh phượng rụng xuống tạo thành một thảm hoa rực rỡ, rất thơ mộng. Lúc này học sinh chúng em lại thích ngồi dưới tán phượng, ngắm những cánh phượng rơi, nhặt những bông hoa phượng ép vào trang vở trắng làm kỷ niệm.

 

Hoa phượng được lũ học sinh chúng em gọi bằng cái tên thân thương- hoa học trò. Hoa phượng cùng năm tháng chứng kiến những lớp học sinh càng ngày càng trưởng thành, chia tay những học trò cũ, đón những lứa học sinh mới đến với bến đò tri thức. Phượng chứng kiến những kỉ niệm buồn vui của học trò. Đứng nơi sân trường, ngẩng đầu nhìn những bông hoa phượng đầu tiên xuất hiện, lòng em lại nôn nao bao cảm xúc. Hoa phượng là báo hiệu cho mùa thi, là bắt đầu cho những ngày hè được nghỉ ngơi, vui chơi thỏa thích. Thế nhưng mùa hoa phượng nở cũng là mùa chia tay. Đó là lúc chúng em phải xa thầy cô, xa bạn bè, xa mái trường thân thương, chuẩn bị bước vào một chặng đường mới, một môi trường mới. Thế nhưng chắc chắn trong lòng chúng em sẽ luôn chứa những kỷ niệm, chứa đựng một màu đỏ của loài hoa thân thương.

Em rất yêu thích hoa phượng. Nó đã trở thành một mảnh ghép quan trọng trong ký ức tuổi thơ em.

2

Những người lính cầm cây súng ra với biển khơi với quyết tâm và sự can trường. Bởi vì các anh không chỉ bảo vệ vùng biển mà còn mang trách nhiệm xây dựng cho hòn đảo của Tổ quốc được yên bình, ấm no. Sóng gió chỉ thổi bay được cát bụi chứ không thể thổi bớt được tình yêu quê hương tha thiết và sự vững vàng, niềm tin yêu mà các anh dành trọn cho đất nước. Khi chiến tranh qua đi, những người lính biển vẫn tiếp tục cầm chắc cây súng bảo vệ cho vùng hải đảo được bình yên. Bao năm qua luôn như thế, hình ảnh người lính đứng trên đảo vững chãi như ngọn hải đăng vẫn luôn rạng ngời và soi sáng cho bao lí tưởng, làm ấm thêm niềm yêu thương nơi quê nhà. Ngày hôm nay, khi biển xanh quê hương với hai quần đảo quý Trường Sa, Hoàng Sa ngày càng trở thành niềm tự hào bởi những giá trị tài nguyên vô tận, khi kẻ thù vẫn còn nhăm nhe chiếm lấy biển đảo nước ta bằng những âm mưu hiểm ác thì nhiệm vụ của những người lính đảo lại càng quan trọng hơn bao giờ hết.

23 tháng 1 2022

chép mạng rồi bạn phương ơi

21 tháng 10 2021

\(d,ĐK:x\ge1\\ PT\Leftrightarrow\sqrt{x-1}=2+\sqrt{x+1}\\ \Leftrightarrow x-1=2+x+1+4\sqrt{x+1}\\ \Leftrightarrow4\sqrt{x+1}=-4\Leftrightarrow x\in\varnothing\left(4\sqrt{x+1}\ge0\right)\\ g,ĐK:x\ge\dfrac{1}{2}\\ PT\Leftrightarrow x+\sqrt{2x-1}+x-\sqrt{2x-1}+2\sqrt{\left(x+\sqrt{2x-1}\right)\left(x-\sqrt{2x-1}\right)}=2\\ \Leftrightarrow2x+2\sqrt{x^2-2x+1}=2\\ \Leftrightarrow\sqrt{\left(x-1\right)^2}=\dfrac{2-2x}{2}=1-x\\ \Leftrightarrow\left|x-1\right|=1-x\\ \Leftrightarrow\left[{}\begin{matrix}x-1=1-x\left(x\ge1\right)\\x-1=x-1\left(x< 1\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\left(tm\right)\\x\in R\end{matrix}\right.\)

 

2 tháng 12 2021

Bài 3.

Định luật ll Niu-tơn:

\(\overrightarrow{F}+\overrightarrow{F_{ms}}=m\cdot\overrightarrow{a}\)

\(\Rightarrow F-F_{ms}=m\cdot a\)

Gia tốc vật:

\(a=\dfrac{F-F_{ms}}{m}=\dfrac{4,5-\mu mg}{m}=\dfrac{4,5-0,2\cdot1,5\cdot10}{1,5}=1\)m/s2

Vận tốc vật sau 2s:

\(v=a\cdot t=1\cdot2=2\)m/s