a) -2x(x-y)-2xy b) -7(2x-3y+4z)-6(y-5z)
źródło:
a) -2x(x-y)-2xy=-2x^2+4xy-2xy=-2x^2-2xy b) -7(2x-3y+4z)-6(y-5z)=-14x+21y-28z-6y+30z=-14x+15y+2z
-2x(x-y)-2xy=-2x^2+2xy-2xy=-2x^2
-7(2x-3y+4z)-6(y-5z)=-14x+21y-28z-6y+30z=-14x+15y+2z