September 2018 2 45 Report
Calcula
a) (+7) · (-2) d) (+6) · (-15) g) (-9) · (+5)

b) (+4) · (+7) e) (+3) · (-7) h) (-5) · (-4)


c) (-2) · (+2) f) (+5) · (+8) i) (+12) · (+3)

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