题目内容
已知x+
=z+
=1，求y+
的值．
| 1 |
| y |
| 1 |
| x |
| 1 |
| z |
∵x+
=z+
=1，
∴
=1-x，z=1-
=
，
∴y=
，
=
，
∴y+
=
+
=
=1．
| 1 |
| y |
| 1 |
| x |
∴
| 1 |
| y |
| 1 |
| x |
| x-1 |
| x |
∴y=
| 1 |
| 1-x |
| 1 |
| z |
| x |
| x-1 |
∴y+
| 1 |
| z |
| 1 |
| 1-x |
| x |
| x-1 |
| 1-x |
| 1-x |
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