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a) 2 i 8/12 - 1 9/12 = 11/12
b) 17/4 - 21/10 + 42/40 = 170/40 - 84/40 + 42/40 = 128/40 = 3 i 3/40
2.
a) 4/10 - 8/30 = 12/30 - 8/30 = 4/30 = 2/15
b) 50/7 : 25/14 - 1 i 2/5 = 4 - 1 i 2/5 = 2 i 3/5