A cylinder and a cone have the same volume, and the ratio of the height of the cylinder to the cone is 3:1, then how many times the area of the base of the cone is that of the cylinder.
一个圆柱与一个圆锥体积相等，已知圆柱与圆锥的高的比是3：1，那么圆锥的底面积是圆柱的多少倍．
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