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b) 5/6 - 0,8 = 5/6 - 8/10 = 50/60 - 48/60 = 2/60 = 1/30
c) 7/11 + 0,25 = 7/11 + 1/4 = 28/44 + 11/44 = 39/44
d) 4/15 + 0,74 = 4/15 + 37/50 = 40/150 + 111/150 = 151/150 = 1 1/150
e) 1 1/3 * 1,25 = 1 1/3 * 1 1/4 = 4/3 * 5/4 = 20/12 = 1 8/12 = 1 2/3