look!

来源：学生作业学帮网 编辑：学帮网 时间：2024/05/05 09:49:13

look!

设竖着的墙长xm,横着的ym.
5x+y=32
面积=xy=x(32-5x)=51.2-5(x-3.2)^2
所以当x=3.2时 面积最大=51.2

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