x分之1,x平方减4分之2x,2-x分之3y的最简公分母是什么?计算：x-1分之1减x+1分之1减x平方+1分之2

2x/(x^2-4)=2x/((x-2)*(x+2))最简公分母是x*(x-2)*(x+2)1/(x-1)-1/(x+1)-2/(x^+1)=(x+1-x+1)/(x^2-1)-2/(x^+1)=2/(x^-1)-2/(x^+1)=(x^2+1-x^2+1)/(x^4-1)=2/(x^4-1)=2/((x^2+1)*(x+1)*(x-1))