本期回答的两个问题：1. 为什么正整数集与正偶数集是相等的呢？按对应关系来说1对应2，2对应4……都能一一对应，这个我不太认可，这个属于“人为选择实验数据”了。为什么不是4对应2，8对应4……，这样对应也是全能对应，正整数集还富裕很多数呢。究竟数学上是怎么算出的两集相等呢？按什么规则来判断的呢？2. 关于0.9循环不等于1的一个“证明”，错在哪里？喜马拉雅FM：https://www.ximalaya.com/keji/6310606/ （欢迎加入Ximi团）微信关注：dalaoli_shuxue B站: https://space.bilibili.com/423722633 知乎：https://zhuanlan.zhihu.com/dalaoli-shuxue/ 电邮 ：[email protected]
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