一个圆锥形麦堆,底面周长是18.84m,高是2.1m,已知每立方米小麦重0.75吨,这堆小麦重多少吨?
问题描述:
一个圆锥形麦堆,底面周长是18.84m,高是2.1m,已知每立方米小麦重0.75吨,这堆小麦重多少吨?
急 .我咋做出来有四位小数= =
答
.0.75×〔3.14×(18.84÷3.14÷2)²×2.1×1/3〕
= 0.75×〔3.14×9×2.1×1/3〕
= 0.75×19.782
= 14.8365
≈ 15(吨)
答:这堆小麦约重15吨.