preparation

"tg" là trung gian bạn nhé!

12. Her brother really enjoys this job despite the low salary.

13. Although she is unkind, we still love her.

14. Though the room is dirty, Mary didn't clean it.

15. Despite the wonderful film poster, I don't like to see it.

16. Mrs Tuyet advised Nga not to lend him anymore money.

17. It was too late for anything to be done.

`x^2-x=-2x+2`

`<=>x^2+x-2=0`

Vì `a+b+c=0 => x_1=1; x_2=-2`

Vậy `S={1;-2}`.

`(4x^2-3)^2+8=0`

`(4x^2-3)^2=-8`

Vì `(4x^2-3)^2 >=0> -8` với mọi `x` nên PT trên vô nghiệm.

1. Your book isn't the same as Lan's book.

2. Tom has learnt English since 1990.

1. cleaned
2. Have you ever recycled
3. has donated 
4. Has Tom participated
5. didn't start
6. haven't finishied
7. watched
8. have travelled
9. have read
10. have lived

The book is too boring (for me) to read.

I wish we hadn't had a lot of homework yesterday.

1. collected - was
2. have been
3. didn't go
.
1. Everything in the house was checked by the police.
2. The photograph is not as big as the painting.
3. Her book is different from mine.
4. It only takes us 20 minutes to walk to school.