а)=(1/6 + 4/6)х3=5/6 х3= 5/2 = 2целых 1/2
б) =(17/30 - 4/30): 13= 13/30 : 13= 13\30 х 1/13 = 1/30
в) = (1/8 + 6/8): 5 =7/8 х1/5= 7/40
г) = (12/9 + 1/9)х 4 = 13/9 х 4 =42/9= 4 целых6/9 = 4 2/3
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а)=(1/6 + 4/6)х3=5/6 х3= 5/2 = 2целых 1/2
б) =(17/30 - 4/30): 13= 13/30 : 13= 13\30 х 1/13 = 1/30
в) = (1/8 + 6/8): 5 =7/8 х1/5= 7/40
г) = (12/9 + 1/9)х 4 = 13/9 х 4 =42/9= 4 целых6/9 = 4 2/3