29(14):已知数列{an}是首项a1=m,公差为2的等差数列;数列{bn}满足2bn=(n+1)an.若对任意n∈N*都有bn≥b5成立,求实数a的取值范围.网上有此题,但我看不懂.
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![29(14):已知数列{an}是首项a1=m,公差为2的等差数列;数列{bn}满足2bn=(n+1)an.若对任意n∈N*都有bn≥b5成立,求实数a的取值范围.网上有此题,但我看不懂.](/uploads/image/z/15081925-13-5.jpg?t=29%EF%BC%8814%EF%BC%89%EF%BC%9A%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E6%98%AF%E9%A6%96%E9%A1%B9a1%3Dm%2C%E5%85%AC%E5%B7%AE%E4%B8%BA2%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%EF%BC%9B%E6%95%B0%E5%88%97%7Bbn%7D%E6%BB%A1%E8%B6%B32bn%3D%EF%BC%88n%2B1%EF%BC%89an%EF%BC%8E%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8Fn%E2%88%88N%2A%E9%83%BD%E6%9C%89bn%E2%89%A5b5%E6%88%90%E7%AB%8B%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%E7%BD%91%E4%B8%8A%E6%9C%89%E6%AD%A4%E9%A2%98%2C%E4%BD%86%E6%88%91%E7%9C%8B%E4%B8%8D%E6%87%82.)
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