已知公差不为0得的等差数列{an}与等比数列{bn}满足：a1=b1,a3=b3,a7=b5,

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已知公差不为0得的等差数列{an}与等比数列{bn}满足：a1=b1,a3=b3,a7=b5,
A：b11＝a13
B：b11＝a31
C：b11＝a63
D：b63＝a11

公差为P,公比为Q
a1=b1,a3=b3---->a1+2p=a1*q^2----->2p=a1(q^2-1)
a3=b3,a7=b5---->a1+6p=a1*q^4----->6p=a1(q^2-1)(q^2+1)
====>3=q^2+1---->q=1.414.------>p=a1/2(不妨设p=1)
则b11=64,a31=64,
选B

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