1) 9 - (1 5/8 + 3/20) = 9 - 1 - (25/40 + 6/40) = 8 - 31/40 = 7 целых 9/40
2) 3 - (1/6 + 2/3) = 3 - (1/6 + 4/6) = 3 - 5/6 = 2 целых 1/6
3) 4 5/6 - (2 3/8 + 7/12) = 4 5/6 - 2 - (9/24 + 14/24) =
= 2 20/24 - 23/24 = 2 - 3/24 = 1 21/24 = 1 целая 7/8
4) Тут пропущен знак перед скобкой, очевидно, это минус, как и в других примерах.
7 - (2 3/4 + 7/12) = 7 - 2 - (9/12 + 7/12) = 5 - 16/12 = 5 - 1 1/3 = 3 целых 2/3
5) 6 1/4 - (3 2/5 + 3/8) = 6 1/4 - 3 - (16/40 + 15/40) =
= 3 10/40 - 31/40 = 3 - 21/40 = 2 целых 19/40
Пошаговое объяснение:
1 пример:
1) 5. 1/4 - 4. 21/40 =
5. 10/40 - 4. 21/40 =
4. 50/40 - 4. 21/40 =
29/40
2) 29/40 : 1. 9/20 =
29/40 : 29/20 = 29/40 * 20/29 = 20/40 = 1/2
3) 7. 1/5 - 6. 7/8 =
7. 8/40 - 6. 35/40 =
6. 48/40 - 6. 35/40 =
13/40
4) 13/40 : 3/4 = 13/40 * 4/3 = 13/10 * 1/3 = 13/30
5) 1/2 - 13/30 = 15/30 - 13/30 = 2/30 = 1/15
ответ: 1/15
2 пример:
1) 3/4 : 5/6 = 3/4 * 6/5 =
18/20 = 9/10
2) 1 : 1. 1/9 = 1 : 10/9 =
1 * 9/10 = 9/10
3) 2. 1/2 * 2/5 = 5/2 * 2/5 = 1
4) 9/10 + 9/10 = 18/10 = 9/5 = 1. 4/5
5) 1. 4/5 - 1 = 4/5
ответ : 4/5
