Question

1) (5x+y/x-5y + 5x-y/x+5y ) : x во 2-ой +y во 2-ой / x во 2-ой -25 y во 2-ой

Answer 1

$frac{( frac{5x+y}{x-5y} + frac{5x-y}{x+5y} )}{ frac{x^2+y^2}{x^2-25y^2} } =( frac{5x+y}{x-5y} + frac{5x-y}{x+5y} )* frac{(x-5y)(x+5y)}{x^2+y^2}= frac{10x^2+10y^2}{(x-5y)(x+5y)} *frac{(x-5y)(x+5y)}{x^2+y^2}$
$= frac{10(x^2+y^2)(x-5y)(x+5y)}{(x-5y)(x+5y)(x^2+y^2)} =10$