对于任意实数a、b定义运算“*”,如下
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756335243725/SYS201311031027563352437015_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756335243725/SYS201311031027563352437015_ST/1.png)
的值域为
.
考点分析:
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