题目内容
已知
=
.求(
-
)÷(
+x)的值.
| x2 |
| x2-2 |
| 1 | ||||
1-
|
| 1 |
| 1-x |
| 1 |
| 1+x |
| x |
| x2-1 |
(
-
)÷(
+x)
=-
÷
=-
•
=-
∵
=
,
∴
=1-
-
,
即-
=-(
+
)
∴原式=-(
+
).
| 1 |
| 1-x |
| 1 |
| 1+x |
| x |
| x2-1 |
=-
| 2x |
| (1-x)(1+x) |
| x3 |
| (1-x)(1+x) |
=-
| 2x |
| (1-x)(1+x) |
| (1-x)(1+x) |
| x3 |
| 2 |
| x2 |
∵
| x2 |
| x2-2 |
| 1 | ||||
1-
|
∴
| x2-2 |
| x2 |
| 2 |
| 3 |
即-
| 2 |
| x2 |
| 2 |
| 3 |
∴原式=-(
| 2 |
| 3 |
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