577:142857为什么会“转圈”?
· 48 min
Episode 577:142857为什么会“转圈”?
0:00
47:50
142857乘以2、3、4、5、6,为什么数字只是换了位置,绕成一圈的顺序却始终没乱?一乘以7,怎么又突然变成了六个9?这场数字戏法,和七分之一算不完的小数有什么关系?同样是六位一循环,换成十三分之一,为什么就玩不转了?如果换一套计数规则,最后出来“包场”的9,怎么还能变成6?把七颗骰子的点数重新排列,凑出7的倍数,竟然比凑出偶数还容易?小学竖式除法里的余数,又怎样把这些问题串起来,一路通向数学家研究了近百年的难题?这期,旭岽从计算器上的六个数字出发,拆开“走马灯数”背后的数学机关!
文案:神经(小黑)
主播:旭岽
后期:Astra
Shows are listed from Apple Podcasts' charts and directory, and Podcast Index where it is used. Every show and episode belongs to its publisher and plays from the publisher's own feed; this site hosts none of them. Explicit shows are for adult profiles only, and children’s profiles hear only children’s shows. More about this list.