23=1015;35=915;715=715

ĐK: $x\ne \pm 2$

$\frac{x+1}{x+2}-\frac{x}{x-2}=\frac{5x-2}{4-x^2}$

$\iff \frac{x+1}{x+2}-\frac{x}{x-2}+\frac{5x-2}{x^2-4}=0$

$\iff \frac{(x+1)(x-2)-x(x+2)+5x-2}{(x+2)(x-2)}=0$

26 C

27 A

28 B

29 C

30 A

31 to improve

32 gone to HCM City for 6 years

33 where the post office was

34 lending me your ruler?

35 5 hours to get to London

36 Where were you and your btother yesterday?

37 We are going to stay with our grandparents next summer holiday

Where can i see a play? You should go to the center 

A.cinema

B.discotheque

C.theater

D.office

1 the sun

2 roofs

3 renewable 

4 are

5 non-polluting

31 A

32 D

33 B

34 C

35 A

19 D

20 D

21 B

22 C

23 C

24 B

25 A

26 C

27 A

28 A

29 B

30 B