设Sn为数列{an}的前n项和,Sn=kn平方+n ,n属于N*,其中k是常数(1) 求a1和an(2)若对于任意的m属于N*,am,a2m,a4m,成等比数列,求K的值 .,就打后面了,能认识把,,
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![设Sn为数列{an}的前n项和,Sn=kn平方+n ,n属于N*,其中k是常数(1) 求a1和an(2)若对于任意的m属于N*,am,a2m,a4m,成等比数列,求K的值 .,就打后面了,能认识把,,](/uploads/image/z/3929501-29-1.jpg?t=%E8%AE%BESn%E4%B8%BA%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%2CSn%3Dkn%E5%B9%B3%E6%96%B9%2Bn+%2Cn%E5%B1%9E%E4%BA%8EN%2A%2C%E5%85%B6%E4%B8%ADk%E6%98%AF%E5%B8%B8%E6%95%B0%281%29+%E6%B1%82a1%E5%92%8Can%282%29%E8%8B%A5%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E7%9A%84m%E5%B1%9E%E4%BA%8EN%2A%2Cam%2Ca2m%2Ca4m%2C%E6%88%90%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%2C%E6%B1%82K%E7%9A%84%E5%80%BC+.%2C%E5%B0%B1%E6%89%93%E5%90%8E%E9%9D%A2%E4%BA%86%2C%E8%83%BD%E8%AE%A4%E8%AF%86%E6%8A%8A%2C%2C)
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