(1+1/x-1)÷x/x^2-1
=x/(x-1)×(x+1)(x-1)/x
=x+1
计算(x^2/x-1)-x
=(x²-x²+x)/(x-1)
=x/(x-1)
化简1-3a/2b÷3a/2b*2b/3a
=1-3a/2b×2b/3a*2b/3a
=(3a-2b)/3a
计算（1-1/1-x)*x-1/x=
=[(1-x)-1]/(1-x) ×(x-1)/x
=x/(x-1) ×(x-1)/x
=1