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[函数] 最值函数问题求解

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word3000 posted 2016-12-30 07:12 |Read mode
IMG_2306(20161230-070735).jpg

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踏歌而来 posted 2016-12-30 10:24
答案是B吧。
求最值.PNG

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original poster word3000 posted 2016-12-30 11:07
答案是B,谢谢。除了线性规划方法,还有没有其他方法啊?

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踏歌而来 posted 2016-12-30 11:33
是线性规划的题目,用其他方法不知怎么解。

用线性规划,可能是最好解的。
先画出线性规划的可行域,得出四个点。
将4个点分别带入|3x-y|、x+2y,一下子得出结果了。

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