Пошаговое объяснение:
x=( x^2y^2-y-x^2+1)=x(x^2*(y^2-1-(y-1))=x(x^2*(y-1)*(y+1)-(y-1))=x*(y-1)*(x^2*(y+1)-1)=x*(y-1)*(x^y+x^-1)
