已知
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101732903711470/SYS201311031017329037114029_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101732903711470/SYS201311031017329037114029_ST/1.png)
=
.
考点分析:
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