Zad. 1
4+(5x-3y+2)-3(4x-2y+1) =4+5x-3y+2-12x+6y-3=5x-12x-3y+6y+4+2-3=-7x+3y+3
6ab-(-3ab+a-4b+1)+2(ab-4a+5b-3)=6ab+3ab-a+4b-1+2ab-8a+10b-6=
=-a-8a+4b+10b+6ab+3ab+2ab-6=-9a+14b+11ab-7
-4x+(5x-7)-2(x-1)+3(-x-2)-(-3x+5)=-4x+5x-7-2x+2-3x-6+3x-5=
=-4x+5x-2x-3x+3x-7+2-6-5=-x-16
Zad. 2
a) A+B=(4x+2y-1)+(4x-2y+1)=4x+4x=8x
b) B-A=(4x-2y+1)-(4x+2y-1)=4x-2y+1-4x-2y+1=-2y-2y+1+1=-4y+2
c) 2-A-2B=2-(4x+2y-1)-2(4x-2y+1)=-4x-2y+1-8x+4y=-4x-8x-2y+4y+1=-12x+2y+1