等差数列中,a80,且a9>|a8|,Sn为数列的前n项和则s1,s2,...s15都小于0,s16s17,...都大于0为什么
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![等差数列中,a80,且a9>|a8|,Sn为数列的前n项和则s1,s2,...s15都小于0,s16s17,...都大于0为什么](/uploads/image/z/3957274-10-4.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B8%AD%2Ca80%2C%E4%B8%94a9%3E%7Ca8%7C%2CSn%E4%B8%BA%E6%95%B0%E5%88%97%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E5%88%99s1%2Cs2%2C...s15%E9%83%BD%E5%B0%8F%E4%BA%8E0%2Cs16s17%2C...%E9%83%BD%E5%A4%A7%E4%BA%8E0%E4%B8%BA%E4%BB%80%E4%B9%88)
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