两个等差数列{an}{bn}的前n项和分别为An,Bn且An/Bn=(n-3)/(3n+1)则a6/b6
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两个等差数列{an}{bn}的前n项和分别为An,Bn且An/Bn=(n-3)/(3n+1)则a6/b6
![两个等差数列{an}{bn}的前n项和分别为An,Bn且An/Bn=(n-3)/(3n+1)则a6/b6](/uploads/image/z/17653642-34-2.jpg?t=%E4%B8%A4%E4%B8%AA%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%7Bbn%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E5%88%86%E5%88%AB%E4%B8%BAAn%2CBn%E4%B8%94An%2FBn%3D%28n-3%29%2F%283n%2B1%29%E5%88%99a6%2Fb6)
A12=(a1+a12)/2*12=(2a6)/2*12=12a5
同理B12=12b5
a6/b6=A12:B12=84/15
同理B12=12b5
a6/b6=A12:B12=84/15
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