关于数列的几道题1.两个等差数列,它们的前n项和之比为5n+3/2n-1,则这两个数列的第9项之比是()2.一个等比数列{an}中,a1+a4=133 a2+a3=70 求这个数列的通项公式.3.已知a,b,c成等差数列,求证:a^-bc,b^
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![关于数列的几道题1.两个等差数列,它们的前n项和之比为5n+3/2n-1,则这两个数列的第9项之比是()2.一个等比数列{an}中,a1+a4=133 a2+a3=70 求这个数列的通项公式.3.已知a,b,c成等差数列,求证:a^-bc,b^](/uploads/image/z/1071687-39-7.jpg?t=%E5%85%B3%E4%BA%8E%E6%95%B0%E5%88%97%E7%9A%84%E5%87%A0%E9%81%93%E9%A2%981.%E4%B8%A4%E4%B8%AA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%AE%83%E4%BB%AC%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B9%8B%E6%AF%94%E4%B8%BA5n%2B3%2F2n-1%2C%E5%88%99%E8%BF%99%E4%B8%A4%E4%B8%AA%E6%95%B0%E5%88%97%E7%9A%84%E7%AC%AC9%E9%A1%B9%E4%B9%8B%E6%AF%94%E6%98%AF%EF%BC%88%EF%BC%892.%E4%B8%80%E4%B8%AA%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca1%2Ba4%3D133+a2%2Ba3%3D70+%E6%B1%82%E8%BF%99%E4%B8%AA%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F.3.%E5%B7%B2%E7%9F%A5a%2Cb%2Cc%E6%88%90%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%B1%82%E8%AF%81%EF%BC%9Aa%5E-bc%2Cb%5E)
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