A

a/ chia hết cho 10

b ko bit

get more knowledge in documentary

relax after working/studying

get more news

C

A

C

D

A

(2x + 1)⁴ = (2x + 1)⁶

=>(2x+1)⁶-(2x+1)⁴=0

=>(2x+1)⁴.[(2x+1)²-1]=0

=>(2x+1)⁴=0 =>x=-1/2

hoặc (2x+1)²-1=0

=>(2x+1)²=1

=>2x+1=1

=>x=0

weren't - didn't eat

to play

B=45a+79b+30a−54b=75a+25b=25(3a+b)=25.2021=50525

dễ 90=9

1. My father studied Math at university.

2. We were very tired so we stopped walking.

3. I tried to pick the bag up, but it was very heavy.

4. The firemen rescued the woman from the burning house.

5. The cat jumped up into the free.

6. After the film, we went home.

7. It was very cold so we closed the window.

8. You are late ! The lesson started ten minutes ago.

9. The teacher asked a lot of questions yesterday.

10. The programme was very funny, we laughed a lot.