Question

пример а помогите пж​

Answer 1

а) xy(x+y)+yz(y-z)-xz(x+z)=x²y+xy²+y²z-yz²-x²z-xz²

б) a(b²-c²)+b(c²-a²)+c(a²-b²)=ab²-ac²+bc²-a²b+a²c-b²c