(1+6/x+5/x^2)/(x-2-3/x)分子分母同乘以x^2=(x^2+6x+5)/(x^3-2x^2-3x)=(x+5)(x+1)/[x(x+1)(x-3)]=(x+5)/(x^2-3x)你的串号我已经记下，采纳后我会帮你制作
自己算
