k25

`2`

B

What time does she go to work?

D

1 unable

2 preservation

3 productive

4 explanation

`5/12`

`4/5`

đề?

1 does

2 watched

3 will play

4 Has.. smoked

a.`16/4 . x = 16/2`

`x= 16/2 : 16/4`

`x= 16/2 . 4/16`

`x = 1/2.`

b, `2xy<sup>3</sup>4x<sup>2</sup>y+8xy<sup>3</sup>−1x<sup>2</sup>y`

`= 2xy<sup>3</sup> + 8xy<sup>3</sup> + 4x<sup>2</sup>y - 1x<sup>2</sup>y`

`= ( 2 + 8 )xy<sup>3</sup> + ( 4 - 1 )x<sup>2</sup>y`

`= 10xy<sup>3</sup> + 3x<sup>2</sup>y.`