题目内容
先化简,再求值:
÷(1-
),其中m=
.
| m |
| m2-1 |
| m |
| m-1 |
| 2 |
原式=
÷
=
×(1-m)
=-
,
当m=
时,原式=-
=
-2.
| m |
| (m+1)(m-1) |
| 1 |
| 1-m |
=
| m |
| (m+1)(m-1) |
=-
| m |
| m+1 |
当m=
| 2 |
| ||
|
| 2 |
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题目内容
| m |
| m2-1 |
| m |
| m-1 |
| 2 |
| m |
| (m+1)(m-1) |
| 1 |
| 1-m |
| m |
| (m+1)(m-1) |
| m |
| m+1 |
| 2 |
| ||
|
| 2 |