Pomocy!!!! Daje naj! Potrzebuje tego na zaraz prosze! Pomóżcie

a).(2/3 +5/6) · 12 = (4/6 +5/6) · 12 = 9/6 · 12 = 3/2 · 12 = 18  b).5 i 3/4 - 1 i 1/2 · 2 = 5 i 3/4 - 3/2 · 2 = 5 i 3/4 - 3 = 2 i 3/4 c).5 i 1/4 · 8 +3 · 2 i 1/9 = 21/4 · 8 +3 · 19/9 = 42 +19/3 = 42 +6 i 1/3 = 48 i 1/3 d).7 i 1/2 - 2 · 1 i 5/6 = 7 i 1/2 - 2 · 11/6 = 7 i 1/2 - 11/3 = 7 i 1/2 - 3 i 2/3 =   = 7 i 3/6 - 3 i 4/6 = 6 i 9/6 - 3 i 4/6 = 3 i 5/6 e).1/3 · 6 · 1 i 1/4 = 2 · 1 i 1/4 = 2 · 5/4 = 5/2 = 2 i 1/2