1)1/4+2/3=(1 × 3 + 2 × 4)/12 = 3/12 + 8/12 = 11/12
2)11/12+5/8 = (11 × 2 + 5 × 3)/24 = 22/24 + 15/24 = 37/24 = 1 13/24
3) 1 13/24 +7/12=37/24 + 7/12 = (37 × 1 + 7 × 2)/24 = 37/24 + 14/24 = 51/24 = 17/8 = 2 1/8
4)2 1/8 + 11/24 = 17/8 + 11/24 =(17 × 3 + 11 × 1)/24 = 51/24 + 11/24 = 62/24 = 31/12 = 2 7/12
5)2 7/12 + 1 = 3 7/12
Ответ : 3 7/12