Zapisz w jak nasprostrzej postci a) (a+b)-(2a-b)+(a-2b)= b) (3x-y+1)-(x+y)+(y+x)= c) -(kx+ny)-(3kx+2ny)+(5kx-3ny)= d) ((2ab+a+3)-(3ab-a+3)=

a) (a+b)-(2a-b)+(a-2b)= a+b-2a+b+a-2b=0 b) (3x-y+1)-(x+y)+(y+x)= 3x-y+1-x-y+y+x=3x-y+1 c) -(kx+ny)-(3kx+2ny)+(5kx-3ny)= -kx-ny-3kx-2ny+5kx-3ny=kx-6ny d) ((2ab+a+3)-(3ab-a+3)=(2ab+a+3-3ab+a-3)= -ab+2a