Zapisz w jak najprostszej postaci :   a) (x-2) - (2-y) b) (a+b) + (2a-b) - (a-2b) c) (3x-y+1) - (x-y) + (y-x) d) -(2aDO POTEGI 2 - 3ab) - (2b-3aDO POTEGI 2) + (-ab-b)   daje naj

  a) (x-2) - (2-y)=x-2-2+y=x+y-4   b) (a+b) + (2a-b) - (a-2b)=a+b+2a-b-a+2b=2a+2b=2(a+b)   c) (3x-y+1) - (x-y) + (y-x) = 3x-y+1-x+y+y-x = x+y+1   [latex]d) -(2a^2 - 3ab) - (2b-3a^2) + (-ab-b)= [/latex]   [latex]-2a^2+3ab-2b+3a^2-ab-b= a^2+2ab-3b[/latex]    

a) (x-2) - (2-y)= x-2-2+y= x-4+y b) (a+b) + (2a-b) - (a-2b)= a+b+2a-b-a+2b= 2a+3b c) (3x-y+1) - (x-y) + (y-x)= 3x-y+1-x+y+y-x= x+y+1 d) -(2aDO POTEGI 2 - 3ab) - (2b-3aDO POTEGI 2) + (-ab-b)= -4+3ab-2b+9-ab-b=2ab-3b+5