После преобразования выражение (x-y)² ___ : 3x-3y 2x+2y _____ x²+y2+2xy

=(x -y)²/2(x+y) ÷ 3(x -y)/(x+y)² = =(x -y)² /2(x+y) × (x+y)²/3(x -y) = =(x -y)²*(x+y)² /2(x+y)*3(x -y) = =(x -y)(x+y) /6 =(x² -y²)/6