公差不为0的等差数列满足a3-a7的平方+a11=0,又bn为等比数列,且a7=b7,求b6b8值?
1个回答
2a3-a7的平方+2a11=0
a7^2=2(a3+a11)=2(2a+12d)=4(a+6d)=4a7
a7=4
b6b8=b7^2=a7^2=16
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