题目内容
计算:(x-y)5÷(y-x)6+(-x-y)2÷(x+y)3.
原式=(x-y)-1+(x+y)-1
=
+
=
=
.
故答案为
.
=
| 1 |
| x-y |
| 1 |
| x+y |
| x+y+x-y |
| x2-y2 |
| 2x |
| x2-y2 |
故答案为
| 2x |
| x2-y2 |
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题目内容
| 1 |
| x-y |
| 1 |
| x+y |
| x+y+x-y |
| x2-y2 |
| 2x |
| x2-y2 |
| 2x |
| x2-y2 |