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一根2米长的圆柱形木材，锯成3段小圆柱后，它们的表面积总和比原来增加了12.56平方分米。
一根2米长的圆柱形木材，锯成3段小圆柱后，它们的表面积总和比原来增加了12.56平方分米。
2025-04-04 06:31:24
推荐回答（1个）
回答1：
截三段，则增加2×2=4个横截面
则一个横截面的面积为：12.56÷4=3.14平方分米
3.14×2.4=7.536立方分米
答原来的体积为7.536立方分米
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