look!

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look!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

look!
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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