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blogTitle:'牟合方盖',

blogAbstract:'刘徽是我国数学史上一位非常伟大的数学家。他的杰作《九章算术注》和《海岛算经》，可算是我国最宝贵的数学遗产之一。遗憾的是，关于这位伟大数学家的籍贯、履历和生卒年代，我们所知甚少，祇知道他是魏晋时代的人，即大约生存于公元三世纪。

刘徽在他的《九章算术注》中，提出一个独特的方法来计算球体的体积：他不直接求球体的体积，而是先计算另一个叫「牟合方盖」的立体的体积。

所谓「牟合方盖」，就是指由两个同样大小但轴心互相垂直的圆柱体相交而成的立体。',

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