题目内容
先化简,再求值.
-
÷
,其中m=
-1.
| 2m |
| m+1 |
| m2-2m+1 |
| m2-1 |
| m-1 |
| m |
| 3 |
原式=
-
×
=
-
=
,
当m=
-1时,原式=
=
.
| 2m |
| m+1 |
| m-1 |
| m+1 |
| m |
| m-1 |
=
| 2m |
| m+1 |
| m |
| m+1 |
=
| m |
| m+1 |
当m=
| 3 |
| ||
|
3-
| ||
| 3 |
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