1. B

2. C

3. A

4. 

5. C

6. D

7. A

8.C (maybe)

9. 

10. C

11. B

12.A

D

1. D, haven't -> don't have

2. C: careful -> carefully

3. D: themself -> themselves

4: B: to play-> play

5. B: putting -> put

Hóa học: b,d

Vật lý: a, c

=)) iQ

1, =3x (2x -3y)

c, = 3x(x-y) -2(x-y)

= (3x-2)(x-y)

2, Ta có: x² -6x+10= (x-3)² +11

Nhận xét: (x-3)² >= 0 với mọi số thực x

=> (x-3)² +1 >= 1 >0 (đpcm)

=))

= 5-3. 2/3 +1/8

= 5- 2 +1/8

= 25/8