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sa one zawsze dodatnie
a)
|-1| + |-1| + |-1| = 1 + 1 + 1 = 3
b)
|-1| - |-1| + |-1| = 1 - 1 + 1 = 1
c)
|-1| - |-1| - |-1| = 1 - 1 - 1 = -1