c

155

tớ sửa lại theo ý kiến tớ nha

they have a fifteen - minute break

6. a

7. c

8. c

9. b

10. why don't u

số hsinh nam bằng :

\(\dfrac{2}{5}\) : \(\dfrac{1}{2}\) = \(\dfrac{4}{5}\) (số hsinh nữ)

hiệu số phần bằng nhau :

5 - 4 = 1 (phần)

số hsinh nam trong lớp :

2 : 1 x 4 = 8 (hsinh)

số hsinh nữ trong lớp :

32 - 8 = 24 (hsinh)

3. the price didn't want to mary that girl

4. they didn't ride bicycle to school

5. i didn't have english yesterday

6. he didn't use to my best friend

các câu trên đều sử dụng cấu trúc khẳng định chia thì qkd với dt thường

cấu trúc : s + didn't + v_inf + o + ...

7. did your father use to tell you stories ?

8. was she in class 7a last year ?

9. did the prince want to marry that girl ?

10. did they ride bicycle to school ?

11. did you have english yesterday

12. did he use to be your best friend ?

cấu trúc câu nghi vấn với dt thường : did + s + vo ?

cấu trúc câu nghi vấn với qkd và dt tobe : was/were + s + o/adj ?

13. my house is not big enough for us to live in

14. i am old enough to play games 

15. she is lucky enough to have a good friend

cấu trúc : s + tobe + adj + enough + (for sb) + to v_inf

5 tấn 2 tạ = 5200 kg, 9 tạ = 900 kg

năm ngoái, thu hoạch được số cà phê :

(5200 - 900) : 2 = 2150 (kg)

năm nay, thu hoạch được số cà phê :

(5200 + 900) : 2 = 3050 (kg)

ex4

1. am not/don't want

2. is having

3. are/is

4. does/like

5. is cooking/cooking

6. to have

7. have/written/wrote

8. is going to fyl

ex5

1. visited 

2. bought

3. gave

4. arrived

5. spoke

6. taught

7. saw

8. were

9. put

10. lived

ex6

1. did/learn

2. am having

3. is there

4. have ever eaten

5. is

6. did/save

7. bought

8. doesn't drink

9. need

10. have never enjoy

d

a. 10 m/s

b. 43,2 m/s

c. \(\dfrac{40}{3}\) m/s

d. \(\dfrac{50}{3}\) m/s

quy tắc đổi :

1 km/h = 3,6 m/s

1 m/s = \(\dfrac{1}{3,6}\) km/h