1) (-2)+(+3) a) +2 b) -1 c) +1 d) -2 2) (-2)+(-1) a) (+1) b) (-3) c) 0 d) (-1) 3) (-2)-(-3) a) (+1) b) (-5) c) (+5) d) (-2) 4) (+1)-(-2) a) (-1) b) (-3) c) (+3) d) (+1)

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