1387.
1. 3/14 + 3/7 – 1/21 = 9 + 18 - 2/42= 25/43
2. 4/9 - 13/15 - 2/3 = 20 + 39 - 30/45 = 29/45
3. 5 5/12 + 3 15/16 - 1 5/8 = 7 + 35/48 = 7 35/38
4. 8 9/10 - 2 3/5 + 1 18/25 = 8 + 1/50 = 8 1/50
"/" – дробь.
1387.
1. 3/14 + 3/7 – 1/21 = 9 + 18 - 2/42= 25/43
2. 4/9 - 13/15 - 2/3 = 20 + 39 - 30/45 = 29/45
3. 5 5/12 + 3 15/16 - 1 5/8 = 7 + 35/48 = 7 35/38
4. 8 9/10 - 2 3/5 + 1 18/25 = 8 + 1/50 = 8 1/50
"/" – дробь.