Пошаговое объяснение:
= 3. 5/7 + 1. 2/9 - 2. 1/7 - 4/9 =
3. 45/63 + 1. 14/63 - 2. 9/63 - 28/63 =
4. 59/63 - 2. 9/63 - 28/63 =
2. 50/63 - 28/63 = 2. 22/63
Пошаговое объяснение:
= 3. 5/7 + 1. 2/9 - 2. 1/7 - 4/9 =
3. 45/63 + 1. 14/63 - 2. 9/63 - 28/63 =
4. 59/63 - 2. 9/63 - 28/63 =
2. 50/63 - 28/63 = 2. 22/63