先化简:(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429808046116/SYS201311011934298080461016_ST/0.png)
-x+1)÷
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429808046116/SYS201311011934298080461016_ST/1.png)
,然后从-1≤x≤2中选一个合适的整数作为x的值代入求值.
考点分析:
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