先化简:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101185729590295692/SYS201311011857295902956017_ST/0.png)
,并从0,-1,2中选一个合适的数作为a的值代入求值.
考点分析:
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