Question

把一米长的圆柱体锯成2段，表面积增加4平方分米原来的体积是多少立方分米?的做题方法要算式

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Answer 1

得看是怎么锯的!如果锯完剩下两个圆柱体!那么:派×(半径的平方)=4/2(注意单位为分米) 半径为根号下2/派, 表面积为 4+半径 X 派 X 10=答案
如果锯完剩下两个半圆柱体 那么直径X10=4/2 直径为 0.2分米 表面积为0.1*0.1*派*2+0.2*派*10