December 2018 1 9 Report
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)-(2a²-3ab)-(2b-3a²)+(-ab-b)
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