爱上海后花园

解1\x^2+3x+2+1\x^2+5x+6+1\x^2+7x+12+1/x^2+9x+20

=1x1x21x2x31x3x41x4x5=1x11x21x21x31x31x41x41x5=1x11x5=4x178;6x5...

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