(3m^2-2nm-3nm+2m^2)n=3nm^2-2mn^2-3mn^2+2nm^2=5nm^2-5mn^2=5mn(m-n)
3х+у=2х-2у=3
8x=9
2·-2y=3
y= -
(x,y)=(
3·= 2·-2·(-)=3
3=3=3
ответ: (x,y)= ()