数列难题.给定正整数n和正数M,对于满足条件的 a2(1)+a2(n+1)≤M的所有等差数列a1,a2,a3.,试求S=a(n+1)+a(n+2)+...+a(2n+1)的最大值.这里,()都是角标做出者50分.至少.
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![数列难题.给定正整数n和正数M,对于满足条件的 a2(1)+a2(n+1)≤M的所有等差数列a1,a2,a3.,试求S=a(n+1)+a(n+2)+...+a(2n+1)的最大值.这里,()都是角标做出者50分.至少.](/uploads/image/z/4086337-49-7.jpg?t=%E6%95%B0%E5%88%97%E9%9A%BE%E9%A2%98.%E7%BB%99%E5%AE%9A%E6%AD%A3%E6%95%B4%E6%95%B0n%E5%92%8C%E6%AD%A3%E6%95%B0M%2C%E5%AF%B9%E4%BA%8E%E6%BB%A1%E8%B6%B3%E6%9D%A1%E4%BB%B6%E7%9A%84+a2%EF%BC%881%EF%BC%89%2Ba2%EF%BC%88n%2B1%EF%BC%89%E2%89%A4M%E7%9A%84%E6%89%80%E6%9C%89%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97a1%2Ca2%2Ca3.%2C%E8%AF%95%E6%B1%82S%3Da%EF%BC%88n%2B1%EF%BC%89%2Ba%EF%BC%88n%2B2%EF%BC%89%2B...%2Ba%EF%BC%882n%2B1%EF%BC%89%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC.%E8%BF%99%E9%87%8C%2C%EF%BC%88%EF%BC%89%E9%83%BD%E6%98%AF%E8%A7%92%E6%A0%87%E5%81%9A%E5%87%BA%E8%80%8550%E5%88%86.%E8%87%B3%E5%B0%91.)
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