先化简,再求值:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164254072279487/SYS201310221642540722794014_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164254072279487/SYS201310221642540722794014_ST/1.png)
,其中x=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164254072279487/SYS201310221642540722794014_ST/2.png)
.
考点分析:
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