1)(a+b)*(a+b)*(a+b)*(a-b) = (a+b)*(a+b)*(a*a-b*b)
2)(a*a*a-a*a+a-1)*(a+1) = (a*a*a-a*a)*(a*a-1)=a*a(a-1)
3)(x-y)*(x-y)*(x-y)*(x+y) =(x-y)*(x-y)*(x*x-Y*Y)
4)(x*x*x+x*x+x+1)*(x-1) = (x*x*x+x*x)*(x*x-1)= x*x(x-1)
Пошаговое объяснение:
