Bài 4: 

Nhóm 1: x;1/3x; 8x

Nhóm 2: \(x^2;5x^2;-3x^2\)

B C C A  B D C

1 B

2 C

3 C

4 A

5 B

6 D

7 C

Viết lại câu:

6 A

7 A

8 D

9 B

10 C

11 D 

12 A

13 B

14 D

15 A

Lỗi sai

1 C => which

2 C => stopped

3 A => bored

4 B => most

5 B => had stopped

6 C => that

7 C => had knowm

8 A => hadn't been

9 D => learned about

10 B => bỏ

11 B => have come

12 A => would have gone

13 C => would have returned

14 C => knew

6.a

7.a

8.d

9.b

10.c

11.d

12.a

13.b

14.d

15.a

Bài chọn lỗi sai

1.c =>which

2.c => stopped

3.a =>bored

4.b => most

5.b =>had stopped

6.c =>that

7.c => had known

8.a => hadn't been late

9.d => learned about

10.b => rỗng

11.b => would have come

12.a => would have gone

13.c => would have returned

14.c => knew

1 C => hers

2 B => will use

3 D => their

4 A => will be pedaling

5 A => travel

6 C => less

7 D => have they

8 D => than

9 A => worked

10 B => fewer

1 me 

2 too

3 done

doing

having

4 interested

5 as to

6 standing

when

7 helping

8 too

9 such

a

10 used

11 when

12 shouldn't

13 is - cost

Áp dụng tính chất của dãy tỉ số bằng nhau, ta được

\(\dfrac{a}{3}=\dfrac{b}{4}=\dfrac{b-a}{4-3}=23\)

Do đó: a=69; b=92

Chào em, em tham khảo nhé!

1. won't finish

2. had learnt

3. is

4. didn't rain

5. had gone

6. hadn't told

7. would understand

8. will throw

9. would be

10. will post

11. will go

12. is hitting

13. won't do

14. will make

15. will go

16. go

17. eat

18. was washed

19. will be built

20. was cleaned

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