x2-2xy+y2 |
x2-xy |
x |
y |
y |
x |
3 |
3 |
x2-2xy+y2 |
x2-xy |
x |
y |
y |
x |
(x-y)2 |
x(x-y) |
x2-y2 |
xy |
x-y |
x |
xy |
(x+y)(x-y) |
y |
x+y |
3 |
3 |
| ||||
3-
|
| ||
3 |
1 |
a |
1 |
b |
2a+3ab-2b |
a-2ab-b |
A.
| B.-
| C.
| D.1 |
|
y-x |
x-2y |
x2-y2 |
x2-4xy+4y2 |
a+b |
a-b |
2a-2b |
3a+3b |
a2 |
a2-b2 |
a |
b |
2 |
1 |
2 |
1 |
a |
a2-1 |
a2+a |
a-1 |
a |
a2-1 |
a2+2a |
x-2 |
x2 |
2 |
x |
© 2017-2019 超级试练试题库,All Rights Reserved.