题目内容
先化简,再求值:(x+1-
)÷
,其中x=3.
| 3 |
| x-1 |
| x2-4x+4 |
| x-1 |
原式=
•
=
•
=
,
当x=3时,原式=
=5.
| x2-1-3 |
| x-1 |
| x-1 |
| (x-2)2 |
=
| (x+2)(x-2) |
| x-1 |
| x-1 |
| (x-2)2 |
=
| x+2 |
| x-2 |
当x=3时,原式=
| 3+2 |
| 3-2 |
练习册系列答案
相关题目