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一座建于若干年前的水库大坝的横断面如图所示,其中背水面的整个坡面是长为90米、宽为5米的矩形.现需将其整修并进行美化,方案如下:①将背水坡AB的坡度由1:0.75改为1: 3 ;②用一组与背水坡面长边垂直的平行线将背水坡面分成9块相同的矩形区域,依次相间地种草与栽花.(1)求整修后背水坡面的面积;(2)如果栽花的成本是每平方米25元,种草的成本是每平方米20元,那么种植花草至少需要多少元?
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参考答案:
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参考解析:
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