已知{an}是各项均不为0的等差数列,数列{bn}是等比数列,若a1-a7的平方+a13=0,且b7=a7,则b3b11
1个回答
a1-a7的平方+a13=0
a1+a13=a7的平方=2a7
a7=2=b7
b3b11=b7的平方=4
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