1、原式=[2x/(x^2-1)]-[(x+1)/(x^2-1)]=[2x-(x+1)]/(x^2-1)=(x-1)/(x^2-1)=(x-1)/[(x+1)(x-1)]=1/(x+1)2、原式=[x(y-x)]÷[(x-y)^2/xy]×[(x-y)/x^2]=[x(y-x)]×[xy/(x-y)^2]×[(x-y)/x^2]=--y^是什么意思^是这里大家约定俗成表示乘方的意思！