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16d
从π=3.14……,到超过200万亿位,假如圆周率被算尽,意味着什么?
在人类漫长的数学探索历程中,圆周率(π)一直占据着独特而重要的地位。早在公元前 250 年左右,古希腊数学家阿基米德就通过几何方法估算出圆周率的值约为 3.14。此后,随着时间的推移,圆周率的计算精度不断提高。17 世纪,英国数学家威廉・琼斯引入 π ...
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5d
π是无理数,圆的周长也应该是无理数,意味着圆周长不能是整数?
首先强调一点,π确实无理数,这点毋容置疑。有些人总是会下意识地强迫自己想象π在写到很多很多位数之后开始重复,这是不可能的。π是无理数在数学界早就得到了证明,而且证明方法不止一种,有兴趣的可以网上查找,证明方法并不难理解。
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