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b) Liczba przeciwna do 0 jest 0
c) Liczba przeciwna do -2 jest 2
Oblicz:
(-5) + 3 = -2
(-6) + (-2) = -8
28 + (-17) = 11
(-10) +(-21) + 12= (-31) + 12= -19
5 - 8 = -3
(-9) - 8 = (-9) + (-8) = -17
4 - (-12) = 4 + 12 = 16
(-18) - (-6) = (-18) + 6 = -12
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