题目内容
先化简后求值:(
+
)÷
,其中x=4.
| 1 |
| x-1 |
| 1 |
| x+1 |
| x |
| x2-1 |
(
+
)÷
=(
+
)×
=
,
把x=4代入原式得:
原式=
=
.
| 1 |
| x-1 |
| 1 |
| x+1 |
| x |
| x2-1 |
| 1 |
| x-1 |
| 1 |
| x+1 |
| (x+1)(x-1) |
| x |
| 2 |
| x |
把x=4代入原式得:
原式=
| 2 |
| 4 |
| 1 |
| 2 |
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