Объяснение:
2x(y-1)-3(y-1)=(2x-3)(y-1)
(x-y)^2-b(x-y)=(x-y-b)(x-y)
(-x-y)^2-y(x+y)= - (x+y)(-x-y) - y(x+y)=(x+y)(x+y-y)=x(x+y)
(x+y)(x-y)+(x+y)^2=(x+y)(x-y+x+y)=(x+y)2x
