1) (-8)+(+23)= a) +14 b) +15 c) -15 d) +31 2) (-25)-(+12)= a) +34 b) +22 c) -37 d) -13 3) (+8).(-9)= a) -27 b) +72 c) -81 d) -72 4) (-7).(-6)= a) +13 b) +42 c) -1 d) +1 5) (-5).(+6)= a) -30 b) -1 c) +30 d) -8 6) (+12).(-3)= a) +15 b) -15 c) -36 d) +36 7) (+32).(-2)= a) -34 b) -64 c) -3 d) +64 8) (+23) + (-22)=  a) -1 b) +45 c) +4 d) +1 9) (+45).(-2)= a) -47 b) +43 c) -90 d) +90 10) (+34).(-3)= a) -102 b) +2 c) +1 d) -30

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