题目内容
已知y=
÷
-x+1，当x=2009时，求y的值．
| x2+2x+1 |
| x2-1 |
| x+1 |
| x2-x |
y=
×
-x+1=1；故y=1．
故答案为1．
| (x+1) |
| (x+1)(x-1) |
| x(x-1) |
| x+1 |
故答案为1．
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题目内容
| x2+2x+1 |
| x2-1 |
| x+1 |
| x2-x |
| (x+1) |
| (x+1)(x-1) |
| x(x-1) |
| x+1 |