Question

Упростите выражение:где x>y>0​

Answer 1

$\sqrt{x^3-y^3+x^2y-y^2x}=\sqrt{(x^3-y^2x)+(x^2y-y^3)}=\\\\\sqrt{x(x^2-y^2)+y(x^2-y^2)}=\sqrt{(x^2-y^2)(x+y)}=\\\\\sqrt{(x-y)(x+y)(x+y)}=\sqrt{(x-y)(x+y)^2}=|x+y|\sqrt{x-y}=(x+y)\sqrt{x-y}$