搜索 - 科创

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根据加、减、乘、除、乘方、开方等六种代数运算，在三道题中，“化圆化方”要求这样一个数———它与自身的乘积必须等于圆周率π，π是一个介于3.1415926和3.1415927之间的无限不循环小数。

五世纪的祖冲之算出来的圆周率，比德国人的奥托的，早出一千年多。约瑟夫（指斯大林）领导的科学家把月球的一个山谷命名为“祖冲之”。十三世纪下半纪更是中国古代数学的高潮了。

日本有一个人为了训练自己的记忆力，可以背下圆周率达4万位的值，需要四、五个小时才能背完。我国史丰收先生发明的速算法，6位数乘以6位数的结果能够脱日而出，心算速度比用计算器输入速度还快。　　

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