设数列{an}为等差数列,公差d不等于0 ,{bn}是等比数列,公比不等于1若a3=b6 a6=b8 a14=b10
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设数列{an}为等差数列,公差d不等于0 ,{bn}是等比数列,公比不等于1若a3=b6 a6=b8 a14=b10
设数列{an}为等差数列,公差d不等于0 ,{bn}是等比数列,公比q不等于1若a3=b6 a6=b8 a14=b10求等比数列的公比
设数列{an}为等差数列,公差d不等于0 ,{bn}是等比数列,公比q不等于1若a3=b6 a6=b8 a14=b10求等比数列的公比
8是b6,b10的等比中项b8^2=b6*b10即a6^2=a3*a14,(a1+5d)^2=(a1+2d)*(a1+13d) 解得a1=(-1/5)d a6/a3=b8/b6=q^2 q^2=(a1+5d)/(a1+2d)=8/3
q=±2√6/3
q=±2√6/3
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