数学题:用这堆沙在5米宽的公路上铺2厘米厚的路面

  • 时间:2020-05-07 11:42:14
  • 分类:数学世界
  • 阅读:99 次

数学题:一个圆锥形沙堆,底面半径为1米,高为4.5分米,用这堆沙在5米宽的公路上铺2厘米厚的路面,可以铺几米?

数学题解答:做这道题一定要注意统一单位名称!不然即便知道了方法,也容易弄错。

将单位名称统一为“米”。

4.5分米=0.45米,2厘米=0.02米。

先算出圆锥形沙堆的体积:3.14×11×0.45÷3=0.471(立方米)

算出可以铺几米远?0.471÷5÷0.02=4.71(米)

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