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b) (5 i 1/2 - 2/3 * 0,3) :4 = (11/2 - 1/5) : 4 = (55/10-2/10):4 = 53/10 * 1/4 = 53/40 = 1 13/40
c) (3 i 2/3- 1,75) * 1/3 = (11/3-7/4)*1/3 = (44/12-28/12)*1/3 = 16/12*1/3 = 16/36 = 4/9
d) 5 i 1/5 * 0,75 - 2,2: 1 i 5/6 = 26/5 * 3/4 - 11/5*6/11 = 39/10 - 6/5 = 39/10-12/10 = 27/10 = 2 7/10