设数列{an}的各项都是正数,且对任意n属于N+,都有an(an+1)=2(a1+a3+.+an).1,求数列{an}的通项公式2,设bn=3^n+(-1)^(n-1) * 入 * 2an(入为非0整数,n属于N+)试确定入的值,使得对任意n属于N+,都有bn+1>bn成
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![设数列{an}的各项都是正数,且对任意n属于N+,都有an(an+1)=2(a1+a3+.+an).1,求数列{an}的通项公式2,设bn=3^n+(-1)^(n-1) * 入 * 2an(入为非0整数,n属于N+)试确定入的值,使得对任意n属于N+,都有bn+1>bn成](/uploads/image/z/1343194-34-4.jpg?t=%E8%AE%BE%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E5%90%84%E9%A1%B9%E9%83%BD%E6%98%AF%E6%AD%A3%E6%95%B0%2C%E4%B8%94%E5%AF%B9%E4%BB%BB%E6%84%8Fn%E5%B1%9E%E4%BA%8EN%2B%2C%E9%83%BD%E6%9C%89an%28an%2B1%29%3D2%28a1%2Ba3%2B.%2Ban%29.1%2C%E6%B1%82%E6%95%B0%E5%88%97%EF%BD%9Ban%EF%BD%9D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F2%2C%E8%AE%BEbn%3D3%5En%2B%28-1%29%5E%28n-1%29+%2A+%E5%85%A5+%2A+2an%EF%BC%88%E5%85%A5%E4%B8%BA%E9%9D%9E0%E6%95%B4%E6%95%B0%2Cn%E5%B1%9E%E4%BA%8EN%2B%EF%BC%89%E8%AF%95%E7%A1%AE%E5%AE%9A%E5%85%A5%E7%9A%84%E5%80%BC%2C%E4%BD%BF%E5%BE%97%E5%AF%B9%E4%BB%BB%E6%84%8Fn%E5%B1%9E%E4%BA%8EN%2B%2C%E9%83%BD%E6%9C%89bn%2B1%3Ebn%E6%88%90)
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