题目内容
化简,求值:
÷(m-1-
),其中m=
.
| m2-2m+1 |
| m2-1 |
| m-1 |
| m+1 |
| 3 |
原式=
÷
,
=
•
,
=
•
,
=
,
=
,
=
.
∴当m=
时,原式=
=
.
| m2-2m+1 |
| m2-1 |
| (m-1)(m+1)-(m-1) |
| m+1 |
=
| (m-1)2 |
| (m-1)(m+1) |
| m+1 |
| m2-1-m+1 |
=
| m-1 |
| m+1 |
| m+1 |
| m2-m |
=
| m-1 |
| m2-m |
=
| m-1 |
| m(m-1) |
=
| 1 |
| m |
∴当m=
| 3 |
| 1 | ||
|
| ||
| 3 |
练习册系列答案
相关题目