数学题：把一个棱长为4分米的正方体填满水，全部倒进一个底面周长25.12dm、高30dm的圆柱中，求水深?

数学题解答：先求出水的体积：4³＝64（立方分米）

再算出圆柱容器的底面积：25.12÷3.14÷2=4（分米），3.14×4²=50.24（平方分米）

圆柱中的水深：64÷50.24≈1.27（分米）

求水深的依据是：圆柱的体积÷底面积＝高

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