3 5/8 + 1 2/3 = 29/8
+ 5/3 = (29 × 3 + 5 ×
8)/24 = 87/24 + 40/24 =
127/24 = 5 7/24
4 4/9 - 2 5/6 = 40/9
- 17/6 = (40 × 2 - 17 ×
3)/18 = 80/18 - 51/18 =
29/18 = 1 11/18
6 7\12 + (5 3\40 - 4 8\15)= 7 43/84
1) 5 3/40 - 4 8/15 = 203/40 -
68/15 = (203 × 3 - 68 × 8)/120 = 609120 -
544/120 = 65/120 = 13/24
2) 6 7/12 + 13/14 = 79/12
+ 13/14 = (79 × 7 + 13 ×
6)/84 = 553/84 + 78/84 =
631/84 = 7 43/84