Найди значение выражения: а) 8-3 целых6/7 б) 2 целых1/8+3 целых5/12 в) 5 целых13/15+1 целая7/12 г) 7 целых3/8-3 целых5/6

1) 8 - 3 6/7 = 8/1 - 27/7 = 56/7 - 27/7 = 29/7 = 4 1/7.

8/1 приводим к ОЗ 7, 7 : 1 * 8 = 56/7.

2) 2 1/8 + 3 5/12 = 17/8 + 41/12 = 51/24 + 82/24 = 133/24 = 5 13/24.

2 1/8 = 2 * 8 + 1 = 17/8,

3 5/12 = 3 * 12 + 5 = 41/12.

Общ. зн. = 24.

24 : 8 * 17 = 51/24,

24 : 12 * 41 = 82/24.

3) 5 13/15 + 1 7/12 = 88/15 + 19/12 = 352/60 + 95/60 = 447/60 = 7 9/20.

5 13/15 = 5 * 15 + 13 = 88/15,

1 7/12 = 1 * 12 + 17 = 19/12.

Общ. зн. = 60.

60 : 15 * 88 = 352/60,

60 : 12 * 19 = 95/60.

4) 7 3/8 - 3 5/6 = 59/8 - 23/6 = 177/24 - 92/24 = 85/24 = 3 13/24.

7 3/8 = 7 * 8 + 3 = 59/8,

3 5/6 = 3 * 6 + 5 = 23/6.

Общ. зн = 24.

24 : 8 * 59 = 177/24,

24 : 6 * 23 = 92/24.