爱上海后花园

在等比数列{bn}和等差数列{an}中,a1=b1>0,a5=b5,a1不等于a3,试比较a3和b3的大小

a3=a1a52b3=b1b5=a1a5a1a3d0a1a5a3b3=a1a52a1a52=a1a5178;20a3b3...

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