2 |
2 |
1 |
x+y |
1 |
x-y |
2x |
x2-2xy+y2 |
x-y+x+y |
(x-y)(x+y) |
(x-y)2 |
2x |
2x |
(x-y)(x+y) |
(x-y)2 |
2x |
x-y |
x+y |
2 |
2 |
1-
| ||||
1-
|
-2
| ||
2 |
2 |
a+1 |
a-1 |
1 |
a2-2a+1 |
a |
a-1 |
1 |
5 |
x+y |
x |
x+2y |
2x-y |
1 |
x |
x2-2x+1 |
x |
2 |
3 |
x-2 |
1 |
x+2 |
2 |
x2-4 |
2 |
a2 |
a-2 |
4 |
a-2 |
1 |
a2+2a |
3 |
© 2017-2019 超级试练试题库,All Rights Reserved.