等差数列与等比数列的题1.设两个方程x^2-ax+1=0,x^2-bx+1=0的四个根组成以2为公比的等差数列,求ab的值.2.在数列{an}中,Sn=1+k乘an(k≠0,1)(1).求证{an}是等比数列.(2).求{an}的通项.2是这四个根组成的等
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![等差数列与等比数列的题1.设两个方程x^2-ax+1=0,x^2-bx+1=0的四个根组成以2为公比的等差数列,求ab的值.2.在数列{an}中,Sn=1+k乘an(k≠0,1)(1).求证{an}是等比数列.(2).求{an}的通项.2是这四个根组成的等](/uploads/image/z/12173307-51-7.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B8%8E%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97%E7%9A%84%E9%A2%981.%E8%AE%BE%E4%B8%A4%E4%B8%AA%E6%96%B9%E7%A8%8Bx%5E2-ax%2B1%3D0%2Cx%5E2-bx%2B1%3D0%E7%9A%84%E5%9B%9B%E4%B8%AA%E6%A0%B9%E7%BB%84%E6%88%90%E4%BB%A52%E4%B8%BA%E5%85%AC%E6%AF%94%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E6%B1%82ab%E7%9A%84%E5%80%BC.2.%E5%9C%A8%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2CSn%3D1%2Bk%E4%B9%98an%EF%BC%88k%E2%89%A00%2C1%29%281%29.%E6%B1%82%E8%AF%81%7Ban%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97.%282%29.%E6%B1%82%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9.2%E6%98%AF%E8%BF%99%E5%9B%9B%E4%B8%AA%E6%A0%B9%E7%BB%84%E6%88%90%E7%9A%84%E7%AD%89)
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