摘要: 一. 已知数列$\{a_{n}\}$满足$a_{1}=1/2$且$a_{n+1}=a_{n}-a_{n}^{2}$(1) 证明:$1\leq \frac{a_{n}}{a_{n+1}}\leq 2$(2) 设数列$\{a_{n}^{2}\}$的前$n$项和为$S_{n}$,证明$\frac{1}{2... 阅读全文
posted @ 2015-09-20 13:21 张文彪 阅读(238) 评论(0) 推荐(0) 编辑