已知X除以X的平方减X加1等于三分之一,求X的平方除以X的平方加X加1的值

因为x^2-x^2/2=3 ==>x^2=6 ==>x=根号6 1/(1-x)-(1/(1 x))/(x/(x^2-1) x) =1/(1-x)-(1/(1 x))/((x x^3-x)/(x^2-1))=1/(1-x)-(1/(1 x))/(x^3/(x^2-1)) =1/(1-x)-(x^2-1)/(x^3-x^4) =(x^3-x^2 1)/(x^3-x^4) 剩下的吧x带...