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= 9 2/10 - 2 5/10 + 5 1/3 - 3 4/10 = 9 2/10 - 5 9/10 + 5 1/3 =
= 8 12/10 - 5 9/10 + 5 1/3 = 3 3/10 + 5 1/3 = 3 9/30 + 5 10/30 = 8 19/30
(16 i 4/15 - 5 i 3/4) - (9 i 5/12 - 4 i 13/20) =
= 16 16/60 - 5 45/60 - 9 25/60 + 4 39/60 = 20 55/60 - 14 70/60 =
= 20 55/60 - 15 10/60 = 5 45/60 = 5 3/4