Question

Срочно!!!
2 задание
Вариант:Б1

Answer 1

$\sqrt{1.3}\sqrt{5.2}=\sqrt{\frac{13}{10}}\cdot\sqrt{\frac{52}{10}}=\sqrt{\frac{13}{10}\cdot\frac{52}{10}}=\sqrt{\frac{676}{100}}=\frac{\sqrt{676}}{\sqrt{100}}=\frac{26}{10}=2.6\\\frac{\sqrt{28}}{\sqrt{63}}=\frac{\sqrt{2^2\cdot7}}{\sqrt{3^2\cdot7}}=\frac{2\sqrt{7}}{3\sqrt{7}}=\frac{2}{3}$