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原式可以變形成1+1/(x+2)-1-1/(x+3)= 1-1/(x+6)-1+1/(x+5) 化簡一下1/(x+2)(x+3)= 1/(x+5)(x+6) 交叉相乘把括弧打開x^2+5x+6=x^2+11x+30 So x=-4,驗一下沒問題
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