题目内容
先化简
÷
-
,再给x取一个你喜欢的数代入求值.
| x2-4 |
| x2-4x+4 |
| x+2 |
| x+1 |
| x |
| x-2 |
原式=
×
-
…(3分)
=
-
=
…(5分)
∵x≠2,-1,-2,∴x取0,
原式=
=
=-
.
| (x+2)(x-2) |
| (x-2)2 |
| x+1 |
| x+2 |
| x |
| x-2 |
=
| x+1 |
| x-2 |
| x |
| x-2 |
=
| 1 |
| x-2 |
∵x≠2,-1,-2,∴x取0,
原式=
| 1 |
| x-2 |
| 1 |
| 0-2 |
| 1 |
| 2 |
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