题目内容
先化简,再求值:(
-
)÷
,其中x=
.
| 3x |
| x+1 |
| x |
| x-1 |
| x-2 |
| x2-1 |
| ||
| 2 |
原式=
×
=
×
=2x,
当x=
时,原式=2×
=
.
| 3x(x-1)-x(x+1) |
| (x+1)(x-1) |
| (x+1)(x-1) |
| x-2 |
| 2x(x-2) |
| (x+1)(x-1) |
| (x+1)(x-1) |
| x-2 |
当x=
| ||
| 2 |
| ||
| 2 |
| 3 |
练习册系列答案
相关题目