13/14
Пошаговое объяснение:
1) 3 - 1 13/14 = 1 1/14
2) 9/49 : 1 1/14 = 9/49 * 14/15 = 6/35
3) 7/10 - 6/35 = 49/70 - 12/70 = 37/70
4) 37/70 + 2/5 = 37/70 + 28/70 = 65/70 = 13/14
13/14
Пошаговое объяснение:
1) 3 - 1 13/14 = 1 1/14
2) 9/49 : 1 1/14 = 9/49 * 14/15 = 6/35
3) 7/10 - 6/35 = 49/70 - 12/70 = 37/70
4) 37/70 + 2/5 = 37/70 + 28/70 = 65/70 = 13/14