Question

Помогите пожалуйста решить!!!=)

Answer 1

1. $(7- sqrt{7})/( sqrt{14}+ sqrt{2} )= sqrt{7}( sqrt{7} -1)/ sqrt{2}(1+ sqrt{7} )=$
$sqrt{7}( sqrt{7} -1)sqrt{2}(sqrt{7}-1 ) / sqrt{2}(1+ sqrt{7} ) sqrt{2}(sqrt{7}-1 )=$
$sqrt{14}( sqrt{7} -1)^2 / 2*(7-1)= sqrt{14}( sqrt{7} -1)^2 / 12$
2.$2/3 sqrt{27}+ sqrt{3}( sqrt{3}- sqrt{4} )=2/3*3 sqrt{3} + 3 -2 sqrt{3}=3$