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:175 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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