Пошаговое объяснение:
1)
= 4. 12/56 + 8/56 - 2. 42/56 =
4. 20/56 - 2. 42/56 =
3. 76/56 - 2. 42/56 =
1. 34/56 = 1. 17/28.
2)
= 4. 7/7 - 3/7 + 1. 4/7 =
4. 4/7 + 1. 4/7 = 5. 8/7 =
6. 1/7
Пошаговое объяснение:
1)
= 4. 12/56 + 8/56 - 2. 42/56 =
4. 20/56 - 2. 42/56 =
3. 76/56 - 2. 42/56 =
1. 34/56 = 1. 17/28.
2)
= 4. 7/7 - 3/7 + 1. 4/7 =
4. 4/7 + 1. 4/7 = 5. 8/7 =
6. 1/7