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b) 8 1/6 - 3 3/4 = 8 2/12 - 3 9/12 = 7 14/12 - 3 9/12 = 4 5/12
c) 4/5 +3,2 = 4/5 + 32/10 = 8/10 + 32/10 = 40 / 10 = 4
d) 7,2 - 5,5 = 1,7
e) 9 3/4 -5 = 4 3/4
f) 4,5 +12 2/3 = 45/10 + 12 20/30 = 135/30 +12 20/30 = 12 155/30 = 17 5/30 = 17 1/6