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`= 1 - 1/2 + 1 - 1/6 + ... + 1 - 1/56`

`= 1 - 1/(1.2) + 1 - 1/(2.3) + ... + 1 - 1/(7.8)`

`= 7 - (1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4+ 1/4 - 1/5 + 1/5 - 1/6 + 1/6 - 1/7 + 1/7 - 1/8`.

`= 8 - 1/8`

`= 63/64`.

16 tháng 5 2022

`A=1/2+5/6+11/12+19/20+29/30+41/42+55/56`

`A=1-1/2+1-1/6+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56`

`A=(1+1+1+1+1+1+1)-(1/2+1/6+1/12+....+1/56)`

`A=7-(1/[1xx2]+1/[2xx3]+1/[3xx4]+....+1/[7xx8])`

`A=7-(1-1/2+1/2-1/3+1/3-1/4+....+1/7-1/8)`

`A=7-(1-1/8)`

`A=7-(8/8-1/8)`

`A=7-7/8`

`A=56/8-7/8=49/8`

There are 48 trees were planted into 8 rows, each row has an equal number of trees. How many trees are there in each row?6547Câu hỏi 2:There are 200 kilograms of rice in 5 bags. How many kilograms of rice are there in each bag?44424045Câu hỏi 3:What value is 1713 greater than 3804?5518551855172091Câu hỏi 4:Which of the following has the same value as 7500?75 hundreds75 ones75 tens75 thousandsCâu hỏi 5:Find the missing number is the following number pattern? 3696, 3796, …,...
Đọc tiếp

There are 48 trees were planted into 8 rows, each row has an equal number of trees. How many trees are there in each row?

6
5
4
7
Câu hỏi 2:
There are 200 kilograms of rice in 5 bags. How many kilograms of rice are there in each bag?

44
42
40
45
Câu hỏi 3:
What value is 1713 greater than 3804?

5518
5518
5517
2091
Câu hỏi 4:
Which of the following has the same value as 7500?

75 hundreds
75 ones
75 tens
75 thousands
Câu hỏi 5:
Find the missing number is the following number pattern? 3696, 3796, …, 3996

3897
3896
3795
3798
Câu hỏi 6:
A rectangular parcel of land with a length of 35m, a width of 20m. Find the perimeter of this land parcel

110cm
112cm
100cm
115cm
Câu hỏi 7:
How long does it take the minute hand of a clock to move from the number 6 to the number 9?

20 minutes
10 minutes
15 minutes
25 minutes
Câu hỏi 8:
What is the missing number? 5.40 am is 40 minutes after …am.

1
4
6
5
Câu hỏi 9:
There are 365 days in a year and 7 days in a week. How many whole of weeks are there in a year?

55
52
53
56
Câu hỏi 10:
What time is 7 hours after 1 o’clock?

9 o’clock
11 o’clock
8 o’clock
7 o’clock
Nộp bài

5
25 tháng 2 2018

Câu 1

câu 2

40

Câu 3

2091

câu 4

75 thousands

câu 5

3896

câu 6

110 cm

câu 7

15 minutes

câu 8

5

câu 9

52

câu 10

9 o'clock

25 tháng 2 2018

dịch da là

Tết là một lễ hội quốc gia và gia đình. Đây là dịp để mọi người Việt Nam có một thời gian vui vẻ trong khi suy nghĩ về năm cuối cùng và năm sau. Vào dịp Tết, các hội chợ xuân được tổ chức, đường phố và các công trình công cộng được trang trí rực rỡ và hầu hết các cửa hàng đều đông đúc với người mua sắm Tết. Tại nhà, mọi thứ đều được dọn dẹp, thức ăn đặc biệt được nấu chín, các món ăn, nước ngọt, hoa và trầu được làm trên bàn thờ gia đình với những chè hương đốt hương thơm. Việc đầu tiên được thực hiện khi khách hàng may mắn đến và trẻ em được tặng tiền may mắn được gói trong một phong bì màu đỏ nhỏ. Tết cũng là thời gian cho hòa bình và tình yêu. Trong dịp Tết, trẻ em thường xuyên cư xử tốt và bạn bè, người thân và hàng xóm của mình trao cho nhau những lời chúc tốt nhất cho năm mới.

29 tháng 1 2022

ưdaswawdawas

31 tháng 10 2021

sits / reads / goes/ watches/ brushes/ listens/ walks/ fixes/ hears /plays /studies/ repeats 

31 tháng 10 2021

1. sits

2. reads

3. goes

4. watches

5. brushes

6. listens

7. walks

8. fixes

9. hears

10. plays

11. studies

12. repeats

27 tháng 4 2018

Nhớ rằng: \(\frac{n}{a.\left(a+n\right)}=\frac{1}{a}+\frac{1}{a+n}\)

Ta có: \(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{90}\)

           \(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\)

Áp dụng công thức trên, ta có:

            \(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)

             \(A=1-\frac{1}{10}=\frac{9}{10}\)

27 tháng 4 2018

\(Â=\frac{9}{10}\)

16 tháng 5 2022

1, = 3 + 56 - 56 - 56 = 3 - 56 = -53

2, = 43 . (2+4) = 43 . 6 = 258

16 tháng 5 2022

1.(3+56) - (56 +56)

=  3+56 - 56+56

=  3 + 0 +56

=3+56 =59

2. 43.2 +43.4

=  43. (2+4)

=  43 .6

=  258

7 tháng 8 2021
1 man men
2 fish...fish..
3 strawberry.strawberries...
4 knifeknives...
5 radioradios.....
6 busbuses......
7 appleapples........
8 glassglasses......
9 babybabies......
10 dishdishes .......
11 footfeet....
12 toytoys....
13 leafleaves...
14 sandwichsandwiches...
15 boxboxes.....
16 personpeople.....
17 deerdeers....
18 oxoxen..
I. Write the past participles of the following verbs.1. eat => …………....               6. decide => …………....                    11. travel => ………………2. go => ………..….…              7. leave => …………….           12. search => …………..….3. write => ……….....               8. break => …………….                    13. visit => ………………..4. clean => ………….               9. carry => ………….….                    14. do => …………..…..…5. sell => ………...…                10. stay => …………..…                    15. ride =>...
Đọc tiếp

I. Write the past participles of the following verbs.

1. eat => …………....               6. decide => …………....                    11. travel => ………………

2. go => ………..….…              7. leave => …………….           12. search => …………..….

3. write => ……….....               8. break => …………….                    13. visit => ………………..

4. clean => ………….               9. carry => ………….….                    14. do => …………..…..…

5. sell => ………...…                10. stay => …………..…                    15. ride => ……………...

2
28 tháng 2 2022

ate

went

wrote

cleaned

sold

decided

left

broke

carried

travelled

searched

visited

did

rode

28 tháng 2 2022

eat-ate-eaten

go-went-gone

write-wrote-written

clean-cleaned-cleaned

decide-decided-decided

leave-left-left

break-broke-broken

carry-carried-carried

travel-traveled-traveled

search-searched-searched

visit-visited-visited

do-did-done

17 tháng 3 2018

January
February

March

April

May

June

July

August

September

October

November

December

17 tháng 3 2018

Tháng 1 = January

Tháng 2 = February

Tháng 3 = March

1. I like / football / the rain. / playing / in ...................................................................................................2. the / are / in / My toy / brown box. ...................................................................................................3. My uncle has to work hard from 5 in the morning _ _ 7 in the evening.4. Odd one out:A. uncle B. auntC. father D. friend5. is / When / your / birthday?...
Đọc tiếp

1. I like / football / the rain. / playing / in ...................................................................................................

2. the / are / in / My toy / brown box. ...................................................................................................

3. My uncle has to work hard from 5 in the morning _ _ 7 in the evening.

4. Odd one out:

A. uncle B. aunt

C. father D. friend

5. is / When / your / birthday? .............................................................................................

6. me? / you / write / to / Can ...................................................................................................

7. Is it a r_ _nd box? – No, it is a square box.

8. Ha can dance _ _ _ cannot play football.

9. What time is it? – It ... four fifteen.

A. is B. has C. at D. in

10. Mr Smith / a lot of / grows / vegetable / in his garden. ................................................................................................

11. four seasons / our country. / in / are / There ...................................................................................................

12. How _ _ _ is he? – He is 10 years old.

13. What a ... doll! My children like it very much.

A. better B. lovely

C. awful D. expensive

14. Don't write ... the walls.

A. on B. at

C. in D. to

15. and / dance. / swim / My brother / can ...................................................................................................

16. Where / are / from? / you ...................................................................................................

17. There are _ _ _ _ fingers is one hand.

18. My brother is seven _ _ _ _ _ old. 20. your / please. / me / pen, / Show

19. go to / don't / school / on Sunday. / I .........................................................................................................

20. Go _ _ the door, please.

21. Thank you very ... .

A. much B. so

C. many D. too

22. February is the ... month of the year.

A. first B. second

C. third D. four

23. My mother's / in / birthday / is / February. .........................................................................................................

24. I often write to Jack and tell him _ _ _ _ _ my school.

25. Listen _ _ the teacher, please. 28. I'm from France. ... you?

A. Too B. This

C. That D. And

26. What would you ... to drink? – Orange juice, please.

A. have B. like

C. do D. take

27. birthday / is / September. / not in / My brother ................................................................................................

28. My / not / is / school / big. ...................................................................................................

29. Take o_t your pen, children.

30. My new pencils are _ _ the table.

31. My class is ... 7 a.m ... 11 a.m every day.

A. between / from B. from / in

C. from / to D. at / at

32. Odd one out:

A. Vietnamese B. Japanese

C. America D. English

4
12 tháng 9 2020

có thể xem bản in ở đây f.vietnamdoc.net/pdf/viewer.html?file=%2fdata%2ffile%2f2017%2f06%2f08%2fbai-tap-luyen-thi-ioe-lop-4.pdf

1 tháng 8 2021

1. I like / football / the rain. / playing / in 
i like playing football in the rain
2. the / are / in / My toy / brown box. 
my toy are in the brown box
3. My uncle has to work hard from 5 in the morning to 7 in the evening.

4. Odd one out:

A. uncle B. aunt

C. father D. friend

 

5. is / When / your / birthday? 
when is your birthdday ?
6. me? / you / write / to / Can 
can you write to me
7. Is it a round box? – No, it is a square box.

8. Ha can dance but cannot play football.

9. What time is it? – It ... four fifteen.

A. is B. has C. at D. in

10. Mr Smith / a lot of / grows /vegetable /grows/
mr smith a lot of vegetable grows in his garden.
11. four seasons / our country. / in / are / There 

there are four seasons in our country. 
12. How old  is he? – He is 10 years old.

13. What a ... doll! My children like it very much.

A. better B. lovely

C. awful D. expensive

14. Don't write ... the walls.

A. on B. at

C. in D. to

15. and / dance. / swim / My brother / can 

my brother can swim and dance
16. Where / are / from? / you 
where are you from ?
17. There are five fingers is one hand.

18. My brother is seven years old.

20. your / please. / me / pen, / Show
show your me pen , please .
19. go to / don't / school / on Sunday. / I 
i don't go to  school on Sunday.
20. Go to the door, please.

21. Thank you very ... .

A. much B. so

C. many D. too

22. February is the ... month of the year.

A. first B. second

C. third D. four

23. My mother's / in / birthday / is / February. 
My mother's birthday is in  February. 
24. I often write to Jack and tell him about my school.

25. Listen _ _ the teacher, please. 28. I'm from France. ... you?

A. Too B. This

C. That D. And

26. What would you ... to drink? – Orange juice, please.

A. have B. like

C. do D. take

27. birthday / is / September. / not in / My brother 
my mother is birthday not in September.
28. My / not / is / school / big. 
my school is not  big. 
29. Take out your pen, children.

30. My new pencils are on the table.

31. My class is ... 7 a.m ... 11 a.m every day.

A. between / from B. from / in

C. from / to D. at / at

32. Odd one out:

A. Vietnamese B. Japanese

C. America D. English