Question

 Помогите пожалуйста! СРОЧНО!
 $frac{2 sqrt{70}- 2sqrt{28} }{3 sqrt{35-3 sqrt{14} } }$

Answer 1

$frac{2sqrt{7}(sqrt{10}-2)}{3sqrt{7}(sqrt{5}-sqrt{2})}= frac{2 sqrt{2}( sqrt{5}- sqrt{2})}{3(sqrt{5}-sqrt{2})}= frac{2 sqrt{2}}{3}$

Answer 2

$frac{2sqrt{70}-2sqrt{28}}{3sqrt{35}-3sqrt{14}}=frac{(2sqrt{70}-2sqrt{28})(3sqrt{35}+3sqrt{14})}{9*35-9*14}=\ frac{30sqrt{98}+6sqrt{980}-6sqrt{980}-6sqrt{392}}{189}=\ frac{30sqrt{98}-12sqrt{98}}{189}=frac{18sqrt{98}}{189} = frac{sqrt{8}}{3}$