a) $$\frac{\sqrt{2}}{\sqrt{18}}=\sqrt{\frac{2}{18}}=\sqrt{\frac{1}{9}}=\frac{1}{3}$$
б) $$\frac{\sqrt{23}}{\sqrt{2300}}=\sqrt{\frac{23}{2300}}=\sqrt{\frac{1}{100}}=\frac{1}{10}$$
в) $$\frac{\sqrt{52}}{\sqrt{117}}=\sqrt{\frac{52}{117}}=\sqrt{\frac{4}{9}}=\frac{2}{3}$$
г) $$\frac{\sqrt{12500}}{\sqrt{500}}=\sqrt{\frac{12500}{500}}=\sqrt{25}=5$$
д) $$\frac{\sqrt{7,5}}{\sqrt{0,3}}=\sqrt{\frac{7,5}{0,3}}=\sqrt{25}=5$$
Ответ: а) 1/3; б) 1/10; в) 2/3; г) 5; д) 5