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b) = 1/6 + 4/6 = 5/6
c) = 8/9 - 3/9 =5/9
d) = 13/10 - 2/10 = 11/10 = 1 i 1/10
e) = 10/15 + 3/15 = 13/15
f) = 8/14 + 7/14 = 15/14
g) = 1 4/10 + 2 5/10 = 3 8/10
h) = 3 9/21 + 1 14/21 = 4 23/21
i) = 12/15 - 10/15 = 2/25