先化简,再求值:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194101043161318/SYS201311011941010431613024_ST/0.png)
,其中x=2+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194101043161318/SYS201311011941010431613024_ST/1.png)
.
考点分析:
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