Odpowiedź:
4 i 3/7 + 3,4 = 4 i 3/7 + 3 i 4/10 = 4 i 30/70 + 3 i 28/70 = 7 i 58/70 = 7 i 29/35
3,49 - 1 i 3/5 = 3 i 49/100 - 1 i 3/5 = 3 i 49/100 - 1 i 60/100 = 2 i 149/100 - 1 i 60/100 = 1 i 89/100
4 i 4/9 * 2,7 = 4 i 4/9 * 2 i 7/10 = 40/9 * 27/10 = 12
2 i 5/8 : 0,2 = 2 i 5/8 : 2/10 = 21/8 * 10/2 = 105/8 = 13 i 1/8
