\(\left(x^2-16\right)=0;\left(x-3\right)=0\\x^2=16;x=3\\ x=-4;x=4;x=3\)

Vậy...

D

A

B

B

ác bé gái bắt đầu dậy thì vào khoảng 10 - 11 tuổi và kết thúc dậy thì vào khoảng 15-17 tuổi; các bé trai bắt đầu khoảng 11-12 tuổi và kết thúc vào khoảng 16-17 tuổi.

8D

9A

10C

2

Trọng âm rơi vào gi

1. I‘m sorry. I ( not finish )........haven't finished..............................this work yet

2. Poems as well as plays ( write ).......were written............................. by Shakespeare. 

3. She is having an examination. She wishes she (spend )…...........spent......................a day off on a farm now. 

4. We hate ( watch )............watching......................... the advertising program on TV. 

5. I had a phone call while I ( surf )....................was surfing............... the web. 

6. They ( live ).................have lived.....................in that house since it was rebuilt. 

7. I suggest (burn).............burning..................... coal to heat the house. 

8. If we (not save)………don't save…………… energy, there (be) …………will be…… great shortage in the next  century. 

9. Do you have any difficulty in ( solve ).........solving............................ this problem.

bôi đen là thấy ak ='))