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a = -3
b = 26
-2/13 < -3/26< -1/13
Jest to średnia arytmetyczna danych liczb.
-2/13 = -4/26
-1/13 = -2/26
[-2/13 +(-1/13)]/2 = [ -4/26 +(-2/26]/2 = [-6/26]/2 = -3/26