Odpowiedź :
a]
[tex]A+B=[-5x+2y-6]+[6-3x-4y]=\\\\5x+2y-6+6-3x-4y=2x-2y[/tex]
b]
[tex]A-B=-5x+2y-6-6+3x+4y=2x+6y-12[/tex]
c]
[tex]B-A=6-3x-4y-(-5x+2y-6)=\\6-3x-4y+5x-2y+6=12+2x-6y[/tex]
d]
-A-B=-(A+B)=-(2x-2y)=-2x+2y
a]
[tex]A+B=[-5x+2y-6]+[6-3x-4y]=\\\\5x+2y-6+6-3x-4y=2x-2y[/tex]
b]
[tex]A-B=-5x+2y-6-6+3x+4y=2x+6y-12[/tex]
c]
[tex]B-A=6-3x-4y-(-5x+2y-6)=\\6-3x-4y+5x-2y+6=12+2x-6y[/tex]
d]
-A-B=-(A+B)=-(2x-2y)=-2x+2y