proszs o pomoc szybko! najlepiej żeby było rozpisane mam czas do 10.30

Odpowiedź:
2 i 3/4 + 3 i 2/5 = 2 i 15/20 + 3 i 8/20 = 5 i 23/20 = 6 i 3/20
5 i 2/5 - 2 i 3/4 = 5 i 8/20 - 2 i 15/20 = 4 i 28/20 - 2 i 15/20 = 2 i 13/20
2 i 5/8 * 1 i 3/7 = 21/8 * 10/7 = 30/8 = 3 i 6/8 = 3 i 3/4
5/6 : 5 = 5/6 * 1/5 = 1/6
8 i 4/5 + 1 i 1/5 : 3 i 3/5 = 8 i 4/5 + 6/5 : 18/5 = 8 i 4/5 + 6/5 * 5/18 = 8 i 4/5 + 1/3 = 8 i 12/15 + 5/15 = 8 i 17/15 = 8 i 2/15
(5 i 1/8 - 2 i 5/6) * (2/5 + 2/7) = (5 i 6/48 - 2 i 40/48) * (14/35 + 10/35) = (4 i 54/48 - 2 i 40/48) * 24/35 = 2 i 14/48 * 24/35 = 110/48 * 24/48 = 165/144 = 1 i 21/144 = 1 i 7/48