а = (m-n)*(m^2+m*n+n^2 )
б = (x+y)*(x^2- x*y + y^2)
г=(p+2)(p^2-2p+2^2 )
д=(1+m)(1-m+m^2)
е=(a-1)(a^2+a+1)
в=(-1)(a-b)(a^2+ab+b^2)
а = (m-n)*(m^2+m*n+n^2 )
б = (x+y)*(x^2- x*y + y^2)
г=(p+2)(p^2-2p+2^2 )
д=(1+m)(1-m+m^2)
е=(a-1)(a^2+a+1)
в=(-1)(a-b)(a^2+ab+b^2)