(x-1)⁻¹/x⁻³=x³/(x-1).Шаг 2:
-(1-x)⁻¹=-1/(1-x)=1/(x-1).Шаг 3:
x³/(x-1)+1/(x-1)=(x³+1)/(x-1).Шаг 4:
1+x(x-2)=1+x²-2x=(x-1)².Шаг 5:
(x³+1)/(x-1)×(x-1)²/(x²-x+1)=Шаг 6:
=(x³+1)×(x-1)/(x²-x+1)=
=(x³+1)(x-1)(x+1)/(x³+1)=
=(x-1)(x+1).
(x-1)(x+1)/(1/(x+1)⁻¹)=Шаг 7.
=(x-1)(x+1)×1/(x+1)=
=(x-1).
1,2-1=0,2.