题目内容
先化简，再求值：（
-
）÷
，其中x=6．
| 3 |
| x-1 |
| 1 |
| x+1 |
| x |
| x2-1 |
原式=
÷
=
•
=
，
当x=6时，原式=
=
．
| 3(x+1)-(x-1) |
| (x+1)(x-1) |
| x |
| (x+1)(x-1) |
=
| 2(x+2) |
| (x+1)(x-1) |
| (x+1)(x-1) |
| x |
=
| 2(x+2) |
| x |
当x=6时，原式=
| 2×(6+2) |
| 6 |
| 8 |
| 3 |
练习册系列答案
相关题目