Question

найдите значение выражения $frac{x}{x+y}$при x=$sqrt{2}$,y=$sqrt{8}$

Answer 1

$frac{x}{x+y}= frac{sqrt{2}}{sqrt{2}+ sqrt{8} }= frac{sqrt{2}(sqrt{8}- sqrt{2}) }{(sqrt{2}+ sqrt{8}) (sqrt{8}- sqrt{2}) }= frac{sqrt{16}- sqrt{4} }{8-2 }= frac{2}{6 }= frac{1}{3 }$