爱上海后花园

解方程:1\x(x+1)+1\(x+1)(x+2)+.+1/(x+8)(x+9)=2x+3\x(x+9)

x1xxx1=1xx11xx1=1x1x11x1x2=1x11x21x1x11x11x21x81x9=2x3xx9...

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