Question

упростить выражение ху/x(1/x+1/y)-x+y/x-y

Answer 1

$frac{xy}{x-y} ( frac{1}{x}+ frac{1}{y} )- frac{x+y}{x-y} = frac{xy}{x-y} cdot frac{x+y}{xy} - frac{x+y}{x-y} = frac{x+y}{x-y} - frac{x+y}{x-y} =0$

Answer 2

Сапсибо