题目内容
先化简,再求值:
+
÷x,其中x=
.
| x2-4 |
| x2-4x+4 |
| x2-x |
| x-1 |
| 3 |
| 2 |
| x2-4 |
| x2-4x+4 |
| x2-x |
| x-1 |
=
| (x-2)(x+2) |
| (x-2) 2 |
| x(x-1) |
| x-1 |
| 1 |
| x |
=
| x+2 |
| x-2 |
=
| 2x |
| x-2 |
当x=
| 3 |
| 2 |
| 2x |
| x-2 |
2×
| ||
|
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题目内容
| x2-4 |
| x2-4x+4 |
| x2-x |
| x-1 |
| 3 |
| 2 |
| x2-4 |
| x2-4x+4 |
| x2-x |
| x-1 |
| (x-2)(x+2) |
| (x-2) 2 |
| x(x-1) |
| x-1 |
| 1 |
| x |
| x+2 |
| x-2 |
| 2x |
| x-2 |
| 3 |
| 2 |
| 2x |
| x-2 |
2×
| ||
|