Question

ПОМОГИТЕ!!!!!!!!!!!!!

Answer 1

$(sqrt{2frac{4}{7}}-sqrt{7frac{1}{7}}):sqrt{frac{2}{63}}=$

$=(sqrt{frac{18}{7}}-sqrt{frac{50}{7}})*sqrt{frac{63}{2}}=$

$=sqrt{frac{18}{7}}*sqrt{frac{63}{2}} -sqrt{frac{50}{7}}*sqrt{frac{63}{2}}=$

$=sqrt{frac{18}{7}*{frac{63}{2}}} -sqrt{frac{50}{7}*{frac{63}{2}}=$

$=sqrt{frac{18}{2}*{frac{63}{7}}} -sqrt{frac{50}{2}*{frac{63}{7}}=$

$=sqrt{9*9} -sqrt{25*9}=9-5*3=9-15=-6$