(2001•山东)先化简,再求值:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131019105429180697201/SYS201310191054291806972022_ST/0.png)
,其中a满足a
2+2a-1=0
考点分析:
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