Corretto: (+3)∙(-6) = -18, (-7)∙(-4) = 28, (-2)∙(+5) = -10, (-6)∙(+6) = -36, (+1)∙(+8) = +8, (-5)∙(-5) = 25, (+4)∙(-3) = -12, (-2)∙(-4) = 8, (+3)∙(-2) = -6, (-5)∙(-11) = 55, (+7)∙(-9) = -63, (-7)∙(-1) = +7, (-7)∙(-3) = 21, (+8)∙(-12) = -96, (+11)∙(-8) = -88, (-9)∙(-2) = 18, (+3)∙(+2) = +6, (-3)∙(-2) = 6, (-3)∙(+2) = -6, (+3)∙(-5) = -15, (+5)∙(-8) = -40, (+5)∙(+8) = +40, (-5)∙(-8) = +40, (-5)∙(+8) = -40, (-9)∙(-1) = 9, (-13)∙(-5) = 65, (+6)∙(-4)∙(-2) = 48, (-5)∙(-2)∙(+3) = 30, (-3)∙(+1)∙(-3) = +9, (-2)∙(-3)∙(-7) = -42, Errato: (+3)∙(-6) = 18, (-7)∙(-4) = -28, (-2)∙(+5) = +10, (-6)∙(+6) = 36, (+1)∙(+8) = -8, (-5)∙(-5) = -25, (+4)∙(-3) = 12, (-2)∙(-4) = -8, (+3)∙(-2) = +6, (-5)∙(-11) = -55, (+7)∙(-9) = 63, (-7)∙(-1) = -7, (-7)∙(-3) = -21, (+8)∙(-12) = 96, (+11)∙(-8) = 88, (-9)∙(-2) = -18, (+3)∙(+2) = -6, (-3)∙(-2) = -6, (-3)∙(+2) = +6, (+3)∙(-5) = +15, (+5)∙(-8) = 40, (+5)∙(+8) = -40, (-5)∙(-8) = -40, (-5)∙(+8) = 40, (-9)∙(-1) = -9, (-13)∙(-5) = -65, (+6)∙(-4)∙(-2) = -48, (-5)∙(-2)∙(+3) = -30, (-3)∙(+1)∙(-3) = -9, (-2)∙(-3)∙(-7) = +42,

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