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b) (1-7/9) * (52/10 - 7/10) = 52/10 - 7/10 -364/90 + 49/90= 61/90 - 16/90 - 364/90 + 49/90 = 45/90 - 315/90 = -270/90 = -3
c) 123/1 * 1/10 + 2/10 * 61/10 = 123/10 + 61/50= 128/50 + 61/50= 189/50= 3,78
d) 1,8 : (4/1 - 11/5) = 1,8 : (9/5 - 11/5) = 1,8 : (-2/5) = -9/2 = -4,5
e) (15/10 - 4/3) * 12/5 - 1/10= (18/30 - 14/30) * 12/5 -1/10= 4/30 * 12/5 - 1/10= 16/50 - 1/10 = 16/50 - 6/50= 10/50= 0,2