题目内容
先化简，再选择一个合适的x值代入求值：(
+1)÷(1-
)•
．
| x |
| x+1 |
| 3x2 |
| 1-x2 |
| 1 |
| x-1 |
(
+1)÷(1-
)•
=
÷
•
=
÷
•
=
•
=
．
当x=0，则原式=-1．
| x |
| x+1 |
| 3x2 |
| 1-x2 |
| 1 |
| x-1 |
=
| x+x+1 |
| x+1 |
| 1-x2-3x2 |
| 1-x2 |
| 1 |
| x-1 |
=
| 2x+1 |
| x+1 |
| (1+2x)(1-2x) |
| (1+x)(1-x) |
| 1 |
| x-1 |
=
| 1-x |
| 1-2x |
| 1 |
| x-1 |
=
| 1 |
| 2x-1 |
当x=0，则原式=-1．
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