zapisz w jak najprostszej postaci (x-2)-(2-x)= (a+b)+(2a-b)-(a-2b)= (3x-y+1)-(x+y)+(y-x)= -(2a²-3ab)-(2b-3a²)+(-ab-b)=

(x-2)-(2-x)= x-2-2+x= 2x-4 (a+b)+(2a-b)-(a-2b)= a+b+2a-b-a+2b= 2a+2b (3x-y+1)-(x+y)+(y-x)= 3x-y+1-x-y+y-x= x-y+1 -(2a²-3ab)-(2b-3a²)+(-ab-b)= -2a²+3ab-2b+3a²-ab-b= a²+2ab-3b

(x-2)-(2-x)=x-2-2+x=2x-4 (a+b)+(2a-b)-(a-2b)=a+b+2a-b-a+2b=2a+2b (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1 -(2a²-3ab)-(2b-3a²)+(-ab-b)= -2a²+3ab-2b+3a²-ab-b=a²+2ab-3b

a) x-2-2+x=2x-4 b) a+b+2a-b-a+2b= -4b+2a c)3x-y+1-x-y+y-x= x-y+1 d)-2a²+3ab-2b+3a²-ab-b = a²+2ab-3b