x(y+m) - y(x+m) - m(x+y) = xy + xm - yx - ym - mx - m= xy + xm - yx - ym - mx - m= xy + xm - yx - ym - mx - m= xy + xm - xy - ym - mx - m= xm - ym - mx - m= xm - ym - mx - m= xm - mx - ym - m= 0
Ответ: 0.
x(y+m) - y(x+m) - m(x+y) = xy + xm - yx - ym - mx - m
= xy + xm - yx - ym - mx - m
= xy + xm - yx - ym - mx - m
= xy + xm - xy - ym - mx - m
= xm - ym - mx - m
= xm - ym - mx - m
= xm - mx - ym - m
= 0
Ответ: 0.