化简：x-yx+3y÷x2-y2x2+6xy+9y2-2yx+y

搜题请搜索小程序“爱下问搜题”

问题解答题

化简：

x-y

x+3y

x2-y2

x2+6xy+9y2

x+y

答案

原式=

x-y

x+3y

•

x2+6xy+9y2

x2-y2

x+y

x-y

x+3y

•

(x+3y)2

(x+y)(x-y)

x+y

x+3y

x+y

=1．

连词成句

连词成句。

1. where, the, is, gym (?)

_____________________________________________

2. my, where, is, book (?)

_____________________________________________

3. show, I, you, can (.)

_____________________________________________

4. is, it, here (.)

_____________________________________________

选择题

When I was your age, I dared not go out alone at night, ________ you?

A．dared

B．dare

C．did

D．didn’t