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15问答网 > 一根圆柱形的钢管长是12米,外半径18厘米,内圆半径是10厘米，如果每立方厘米的钢重7.8克,这根钢管重多少吨

一根圆柱形的钢管长是12米,外半径18厘米,内圆半径是10厘米，如果每立方厘米的钢重7.8克,这根钢管重多少吨

2025-04-04 06:15:21

推荐回答（4个）

回答1：

体积=(18X18X3.14-10X10X3.14)X1200=844032立方厘米
重量=844032*7.8=6583449.6克=6.5834496 吨

回答2：

(18x18-10x18)x3.14x1200x7.8=6583449.6克＝6.5834496吨

回答3：

这根钢管重=7.8×3.14×（18×18-10×10）×1200=658449.6克=658.4496千克=0.6584496吨

回答4：

(1200*3.14*18*18-1200*3.14*10*10)=844032克

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