题目内容
计算:
+
-
.
| x+2y |
| 1-x2 |
| y-1 |
| x2-1 |
| y |
| 1-x2 |
原式=
-
-
=
=
=
.
| x+2y |
| 1-x2 |
| y-1 |
| 1-x2 |
| y |
| 1-x2 |
=
| x+2y-y+1-y |
| 1-x2 |
=
| x+1 |
| 1-x2 |
=
| 1 |
| 1-x |
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题目内容
| x+2y |
| 1-x2 |
| y-1 |
| x2-1 |
| y |
| 1-x2 |
| x+2y |
| 1-x2 |
| y-1 |
| 1-x2 |
| y |
| 1-x2 |
| x+2y-y+1-y |
| 1-x2 |
| x+1 |
| 1-x2 |
| 1 |
| 1-x |