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
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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