Question

см вложения;))) жду!!

Answer 1

$frac{x^2-xy}{y-1}* frac{y-1}{x^2} + frac{y-x}{2x} = frac{x(x-y)}{1}* frac{1}{x^2} + frac{y-x}{2x} = frac{x-y}{x}+ frac{y-x}{2x} = frac{2(x-y)+y-x}{2x} = \ \ = frac{2x-2y+y-x}{2x} = frac{x-y}{2x}$