题目内容
先化简:
-
÷
,再从0,1,2,3中选取一个合适的数作为x的值代入求值.
| 1 |
| x2-x |
| x-2 |
| x2-2x+1 |
| x-2 |
| x-1 |
原式=
-
•
=
-
=
=-
,
当x=3时,原式=-
.
| 1 |
| x(x-1) |
| x-2 |
| (x-1)2 |
| x-1 |
| x-2 |
| 1 |
| x(x-1) |
| 1 |
| x-1 |
| 1-x |
| x(x-1) |
| 1 |
| x |
当x=3时,原式=-
| 1 |
| 3 |
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