Question

ПОМОГИТЕ Я НЕ ПОНИМАЮ !! ДАЮ 15 БАЛОВ

Answer 1

Ответ:

$20$

Объяснение:

$x=20$

$(\sqrt{xy}-\frac{xy}{x+\sqrt{xy}}):\frac{\sqrt{xy}-y}{x-y}=\\\\=\frac{\sqrt{xy}(x+\sqrt{xy})-xy}{x+\sqrt{xy}}:\frac{\sqrt{x}\sqrt{y}-(\sqrt{y})^2}{(\sqrt{x})^2-(\sqrt{y})^2}=\\\\=\frac{x\sqrt{xy}+xy-xy}{(\sqrt{x})^2+\sqrt{x}\sqrt{y}}:\frac{\sqrt{y}(\sqrt{x}-\sqrt{y})}{(\sqrt{x}-\sqrt{y})(\sqrt{x}+\sqrt{y})}=\\\\=\frac{x\sqrt{x}\sqrt{y}}{\sqrt{x}(\sqrt{x}+\sqrt{y})}:\frac{\sqrt{y}}{\sqrt{x}+\sqrt{y}}=\\\\=\frac{x\sqrt{y}}{\sqrt{x}+\sqrt{y}}*\frac{\sqrt{x}+\sqrt{y}}{\sqrt{y}}=x=20$