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已知数列{an}是等比数列,m,n,p∈N﹡,且m,n,p成等差数列,求证:am,an,ap依次
人气:419 ℃ 时间:2020-02-04 08:11:52
解答
2n = m + p
am * q / a1 = q^m
an * q / a1 = q^n
ap * q / a1 = q^p
q^m * q^p = q^n * q^n
am * ap = an ^ 2
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