已知变量x,y满足约束条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101826854609733/SYS201311031018268546097013_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101826854609733/SYS201311031018268546097013_ST/1.png)
的取值范围是
.
考点分析:
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