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= (20 - 2/5) : 3/2 = (100/5 - 2/5) : 3/2 = 98/5 · 2/3 = 196/15 = 13 i 1/15
2).(0,76 : 4/5 - 0,5) · 2 = (19/25 · 5/4 - 1/2) · 2 = (19/20 - 1/2) · 2 =
= (19/20 - 10/20) · 2 = 9/20 · 2 = 9/10
3).2³ - (3 i 5/6 +2 i 1/4) = 8 - (3 i 10/12 +2 i 3/12) = 8 - 5 i 13/12 =
= 7 i 12/12 - 6 i 1/12 = 1 i 11/12