Zapisz w jak najprostszej postaci. a) (x-2)-(2-x) b) (a+b)+(2a-b)-(a-2b) c) (3x-y+1)-(x+y)+(y-x) d) -(2a#kwadrat-3ab)-(2b-3a#kwadrat)+(-ab-b)
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A) (x-2)-(2-x)=x-2-1+x=2x-3 b) (a+b)+(2a-b)-(a-2b)=a+b+2a-b-a+2b=2a+2b=2a+2b c) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1 d) -(2a#kwadrat-3ab)-(2b-3a#kwadrat)+(-ab-b)=-2ab+3ab-2b+3a²-ab-b=-3b+3a²
b) (a+b)+(2a-b)-(a-2b)=a+b+2a-b-a+2b=2a+2b=2a+2b
c) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1
d) -(2a#kwadrat-3ab)-(2b-3a#kwadrat)+(-ab-b)=-2ab+3ab-2b+3a²-ab-b=-3b+3a²