Question

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

Answer 1

=(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