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look!

来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/09/24 14:29:41
look!
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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