3(x-y) |
5(y-x) |
3 |
5 |
3(x-y) |
5(y-x) |
3 |
5 |
x-y |
y-x |
A.
| B.
| ||||||||
C.
| D.
|
x+y |
x-y |
( ) |
x2-y2 |
a+b |
( ) |
a2+2ab+b2 |
a2-b2 |
| ||||
|
x+y |
( ) |
A.
| B.
| ||||||||
C.
| D.
|
5x-2y |
3xy |
A.不变 | B.扩大为原来的4倍 | ||
C.缩小为原来的
| D.扩大为原来的8倍 |
a-b |
2ab |
A.扩大为原来的2倍 | B.不变 | ||||
C.缩小为原来的
| D.缩小为原来的
|
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