lxl=x+2

xét x<(=)2:

=>-x=x+2

=>-x-x=2

=>-2x=2

=>x=-1

xét x>2:

=>x=x+2(vô lí)

vậy x=-1

1.She has lived in Ha Noi for 2 years

2.He has studied English since he was young

3.This is the first time I eat this kind of food

4.She is the most beautiful girl i have ever known

5.I have never read the best novel before

1.A

2.B

3.A

4.A

5.A

6.C

7.B

8.A

9.B

what make your new school diferent from others?

B

I'm over twenty years old

A