Question

Найдите значение выражения

Answer 1

$........=\frac{\sqrt{2*9}+\sqrt{2*81}-5\sqrt{2*4}}{\sqrt{2} } =\frac{3\sqrt{2}+9\sqrt{2} -10\sqrt{2}}{\sqrt{2} }=\frac{2\sqrt{2} }{\sqrt{2} } =2$