高中数学代数与函数一其他练习题140
题目内容

设x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20110517/201105171404489441304.gif,若目标函数z=ax+by(a>0,b>0)的最大值为12, 则http://picflow.koolearn.com/upload/papers/g02/20110517/20110517140448944959.gif的最小值为

2021-07-21

A.4

B.http://picflow.koolearn.com/upload/papers/g02/20110517/20110517140448959883.gif

C.http://picflow.koolearn.com/upload/papers/g02/20110517/20110517140448991894.gif

D.http://picflow.koolearn.com/upload/papers/g02/20110517/20110517140449006914.gif

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