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已知目标函数z=2x+y,且变量x、y满足下列条件:,则( ) A.z最大值=1...
已知目标函数z=2x+y,且变量x、y满足下列条件:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124845040008188/SYS201310251248450400081009_ST/0.png)
,则( )
A.z
最大值=12,z无最小值
B.z
最小值=3,z无最大值
C.z
最大值=12,z
最小值=3
D.z
最小值=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124845040008188/SYS201310251248450400081009_ST/1.png)
,z无最大值
考点分析:
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C.14
D.
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