等底等高的圆柱与圆锥，它们的体积和是6.28平方厘米，体积之差是多少？

数学题解答：如果一个圆柱和一个圆锥等底等高，那么圆柱的体积是这个圆锥的体积的3倍。如果将圆锥体积看成1份，那么圆柱的体积就是3份。它们的和是3+1＝4份，它们的差是3-1＝2份。所以，此题可以像下面这样解答：

6.28÷(3+1)×(3-1)=3.14（立方厘米）

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