爱上海后花园

在等比数列an和公差不为0的等差数列bn中,a1=b1>0,a3=b3>0,比较a2与b2,a5与b5

a1=b1a3=b3a2=a1a32b2=b1b3=a1a3a1gt;0a3gt;0a1a3a1a3gt;2a1a3a1a32gt;a1a3a2gt;b2a5a3=a3a1a5=2a3a1b5b3=b3b1b5=b3^2b1=a3^2a1b5a5=a3^2a12a3a1=a3^22a1a3a1^2a1=a1a3^2a1a1a3gt;0a1a3^2gt;0a1a3^2a1gt;0b5a5gt;0b5gt;a5a2gt;b2a5...

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