已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334215940/SYS201311031027563342159008_ST/0.png)
若f(a)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334215940/SYS201311031027563342159008_ST/1.png)
,则a=
.
考点分析:
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