Question

БУДУ БЛАГОДАРНА ЗА ОТВЕТ >.<​

Answer 1

$1)(\frac{\sqrt{y} }{\sqrt{x}-\sqrt{y}} -\frac{\sqrt{y} }{\sqrt{x}} ):\frac{y}{x}=\frac{\sqrt{xy}-\sqrt{xy}+y }{\sqrt{x}(\sqrt{x} -\sqrt{y})}*\frac{x}{y}=\frac{y }{\sqrt{x}(\sqrt{x} -\sqrt{y})}*\frac{x}{y}=\\\\=\boxed{\frac{\sqrt{x}}{\sqrt{x}-\sqrt{y}}} \\\\\\2)\sqrt{m^{2}-6m+9 }=\sqrt{(m-3)^{2} }=|m-3|=\boxed{3-m}$