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39b. -3+(-50)= -53
39c. 7+12+1= 20
39d. -72-(-45)= -27
39e. 25: 5 +15= 5+15=20
39f. 6×6=36
39g. -15+10+8=3
39h. -1 +2×-3×-4= -1+24=23