IV.
A.
1. I rarely play hopscotch with my friends at school.
2. I often play badmiton with my dad on the weekends.
3. My parents usually buy new books at the bookstore.
4. My sister never does martial arts after school.
5. We often go to the library to read books and study.
6. My mom always goes to the supermarket after work.
B.
1. We decorate houses at Halloween.
2. John sometimes plays video games with his friends after school.
3. Fashion show starts at 8 p.m.
4. How do people prepare for Christmas?
5. How often do you go shopping?
6. The bus leaves at 10 a.m.

12.2 cắt quá bạn đăng lại nhé

13

\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)

a.

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

0,4->1,2----->0,4-------->0,6

\(V_{H_2}=0,6.22,4=13,44\left(l\right)\)

b. \(C\%_{HCl}=\dfrac{1,2.36,5.\left(100+20\right)\%}{200}=26,28\%\)

c. \(n_{HCl.dư}=(\dfrac{200.26,28\%}{100\%}:36,5)-1,2=0,24\left(mol\right)\)

\(C\%_{HCl.dư}=\dfrac{0,24.36,5.100\%}{10,8+200-0,6.2}=4,18\%\)

\(C\%_{AlCl_3}=\dfrac{0,4.133,5.100\%}{10,8+200-0,6.2}=25,48\%\)

1A 2A 3B 4C 5A 6B 7B 8C 9A 10D

1 being guilty of stealing the car

2 another way to reach the city center?

3 did he suspected that the money had been stolen

4 were you, I would take more exercise

5 me not to leave

6 not seeing Andrey on her trip to London

7 thought to have been caused by human error

8 Elizabeth if she would be visiting the Taj Mahal when she went to India

9 Marengo trying the chicken

10 never tasted such a delicious cake

He denied stealing the car.

Isn’t there another way to reach the city centre ? 

At no time did he suspect (that) the money had been stolen. 

If I were you, I’d take more exercise.

She persuaded me not to leave.

he greatly regretted not seeing Andrey on her trip to London.

The accident is thought to have been caused by human error.

He asked Elizabeth if she would be visiting the Taj Mahal when she went to India

 The waiter recommended that i should try the chicken Marengo

The water is too hot for me to drink

The food was too salty for us to eat

\(=\dfrac{2x^4-2x^3+2x^2+3x^3-3x^2+3x-2x^2+2x+2-x-5}{x^2-x+1}\)

\(=2x^2+3x-2+\dfrac{-x-5}{x^2-x+1}\)

Vậy: Đa thức dư là -x-5

Gọi số nhóm nhiều nhất lớp có thể chia được là x

Theo đề bài, ta có:

18⋮x; 24⋮x; x lớn nhất

⇒x=ƯCLN(18,24)

Ta có:

18=2x3²

24=2³x3

ƯCLN(18,24)=2x3=6

Hay x=6

Vậy số nhóm nhiều nhất  lớp có thể chia được là 6 nhóm

Khi đó, mỗi nhóm sẽ có số bạn nam là: 18:6=3(bạn)

Khi đó, mỗi nhóm sẽ có số bạn nữ là: 24:6=4(bạn)

Đ/S:6 nhóm

      3 bạn nam

     4 bạn nữ

Gọi số nhóm nhiều nhất lớp có thể chia đc là x (nhóm)

18⋮x; 24⋮x; x lớn nhất

⇒x=ƯCLN(18,24)

Ta có:

18=2x32

24=23x3

ƯCLN(18,24)=2x3=6

Hay x=6

Vậy số nhóm nhiều nhất  lớp có thể chia được là 6 nhóm

Khi đó, mỗi nhóm sẽ có số bạn nam là: 18:6=3(bạn)

Khi đó, mỗi nhóm sẽ có số bạn nữ là: 24:6=4(bạn)

Chúc bạn học tốt!

Câu 1: B

Câu 2: B

Câu 3: A

Câu 4: C

1. be crazy about + N = be a fan of N

2. keen on V-ing = fancy V-ing

3. call for = need

4. take part in = participate in

5. They have raised funds to help disabled children since early 2009.