题目内容
先化简再求值:(
-
)÷
,其中x=1.
| x |
| x-2 |
| x |
| x+2 |
| 4x |
| x-2 |
(
-
)÷
=
•
=
.
当x=1时,原式=
=
.
| x |
| x-2 |
| x |
| x+2 |
| 4x |
| x-2 |
=
| x(x+2)-x(x-2) |
| (x+2)(x-2) |
| x-2 |
| 4x |
=
| 1 |
| x+2 |
当x=1时,原式=
| 1 |
| 1+2 |
| 1 |
| 3 |
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