Question

8КЛАСС КВАДРАТНЫЙ КОРЕНЬ

Answer 1

1) = $sqrt{400} - sqrt{4} =20-2=18$
2) =х-у+у=х

Answer 2

1) $sqrt{2}*( sqrt{200}- sqrt{2} ) = sqrt{2} *( sqrt{100*2}- sqrt{2} )= sqrt{2} *( 10sqrt{2}- sqrt{2})=$$sqrt{2}*9 sqrt{2}=9*2=18$
2) $( sqrt{y} - sqrt{x} )( sqrt{y}+ sqrt{x} )+y=y-x+y=x$