题目内容
先化简,再求值
÷
-
+x,其中x=2009.
| x-1 |
| x2+x |
| x2-2x+1 |
| x2-1 |
| 1 |
| x |
原式=
×
-
+x
=
-
+x
=x,
∵x=2009,
∴原式=2009.
| x-1 |
| x(x+1) |
| (x+1)(x-1) |
| (x-1)2 |
| 1 |
| x |
=
| 1 |
| x |
| 1 |
| x |
=x,
∵x=2009,
∴原式=2009.
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