Пошаговое объяснение:
1) 2. 3/5 + 2/3 =
2. 9/15 + 10/15 =
2. 19/15 = 3. 4/15
2) 14/15 - 2/3 =
14/15 - 10/15 = 4/15
3) 3. 4/15 : 4/15 =
49/15 * 15/4 = 49/4 =
12. 1/4
