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[数列] 转发一题数列-2015浙江高考

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realnumber posted 2015-6-8 07:32 |Read mode
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浙江课本删了数学归纳法,都很久了.$a_n\in (0,1)$,如果非要证明,不用数学归纳法,怎么处理?
活着&存在 posted 2015-6-8 08:41
Last edited by 活着&存在 2015-6-8 08:52 未命名.JPG

递推数列应该只有构造和归纳两方法吧?构造往往过难或过简单,
那只能考查归纳了,可是这又不在范围。出题真的很难呀。

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original poster realnumber posted 2015-6-8 20:59
只会数学归纳法~~~

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力工 posted 2015-6-13 19:41
原题本来就是a1属于(0,1),用均值即可。
活着&存在 posted 2015-6-13 19:57
回复 4# 力工


    本题的难点是证明每一项都为正数

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力工 posted 2015-6-14 21:12
回复 5# 活着&存在


    是啊,由a1属于(0,1)可得到an属于(0,1)
活着&存在 posted 2015-6-15 09:09
回复 6# 力工


    汗,说那么多,到底怎么得到呀?不能给个证明过程吗?

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