Question

Найдите значение выражения (√2,8×√4,2)/√0,24

Answer 1

$frac{sqrt{2,8}*sqrt{4,2}}{sqrt{0,24}}=frac{sqrt{7*0,4}*sqrt{7*0,6}}{sqrt{0,24}}=frac{sqrt{7}*sqrt{0,4}*sqrt{7}*sqrt{0,6}}{sqrt{0,24}}=frac{7*sqrt{0,4*0,6}}{sqrt{0,24}}=\ \ =frac{7*sqrt{0,24}}{sqrt{0,24}}=7$