230问答网 > 一根4米长的圆柱形钢管，横截面直径40厘米，内直径20厘米，这根钢管的体积是多少立方分米

一根4米长的圆柱形钢管，横截面直径40厘米，内直径20厘米，这根钢管的体积是多少立方分米

2025-04-02 03:46:36
推荐回答（4个）
回答1：

376.8立方分米

回答2：

解：r=20/2=10厘米，R=40/2=20厘米，H=4米=400厘米，
所以这根钢管的体积=πR²H-πr²H
=π（400-100）400
=120000π立方厘米。

回答3：

厘米换算成米
0.4 和0.2 4π0.4²-4π0.2² 即可
望采纳！

回答4：

40厘米=4分米，20厘米=2分米
(4/2)^2*40-(2/2)^2*40=160-40=120立方分米

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