摘要: 46 (1)证明: 首先有$2n(n+1)=\left \lfloor 2n(n+1)+\frac{1}{2} \right \rfloor=\left \lfloor 2(n^{2}+n+\frac{1}{4}) \right \rfloor=\left \lfloor 2(n+\frac{1}{ 阅读全文
posted @ 2018-08-14 09:14 朝拜明天19891101 阅读(902) 评论(0) 推荐(0) 编辑