题目内容
先化简,再求值:
÷(x-2-
),其中x=3.
| x2-4 |
| x2+4x+4 |
| 2x-4 |
| x+2 |
原式=
÷
=
×
=
(6分)
将x=3代入得
.(8分)
| x-2 |
| x+2 |
| x2-2x |
| x+2 |
=
| x-2 |
| x+2 |
| x+2 |
| x(x-2) |
=
| 1 |
| x |
将x=3代入得
| 1 |
| 3 |
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题目内容
| x2-4 |
| x2+4x+4 |
| 2x-4 |
| x+2 |
| x-2 |
| x+2 |
| x2-2x |
| x+2 |
| x-2 |
| x+2 |
| x+2 |
| x(x-2) |
| 1 |
| x |
| 1 |
| 3 |