题目内容
(1)
+
(2)
-
.
| a+3b |
| a+b |
| a-b |
| a+b |
(2)
| 2xy2+1 |
| (x-y)2 |
| 1+2x2y |
| (y-x)2 |
(1)
+
=
=
=2;
(2)
-
=
=
=
.
| a+3b |
| a+b |
| a-b |
| a+b |
=
| a+3b+a-b |
| a+b |
=
| 2(a+b) |
| a+b |
=2;
(2)
| 2xy2+1 |
| (x-y)2 |
| 1+2x2y |
| (y-x)2 |
=
| 2xy2+1-1-2x2y |
| (x-y)2 |
=
| 2xy(y-x) |
| (x-y)2 |
=
| 2xy |
| y-x |
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