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b) (-3 -8)*(7-12) = -11*(-5) = 55
c) 4 - (-5) 4 + 5
---------- = ------------ = 9/(-3) = 9 : (-3) = -3
-3 -3
d) (-13 -8) : (-7 +10) = -21 : 3 = -7
f) (-2) * (3 - 7) -(-7 + 2) = (-2) *(-4) -(-5) = 8 + 5 = 13