题目内容
| x2+2xy+y2 |
| x2y+xy2 |
| x2-2xy+y2 |
| x2y-xy2 |
原式=
-
,
=
-
,
=
,
=
,
=
.
| (x+y)2 |
| xy(x+y) |
| (x-y)2 |
| xy(x-y) |
=
| x+y |
| xy |
| x-y |
| xy |
=
| x+y-x+y |
| xy |
=
| 2y |
| xy |
=
| 2 |
| x |
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D、
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