5 1/2-( 1 3/14+11/21)+(4 5/12-2)
Сколько будет? И решение.

5 1/2 - (1 3/14 + 11/21) + (4 5/12 - 2) = 6 5/28

1) 1 3/14 + 11/21 = 1 9/42 + 22/42 = 1 31/42

2) 4 5/12 - 2 = 2 5/12

3) 5 1/2 - 1 31/42 = 5 21/42 - 1 31/42 = 4 63/42 - 1 31/42 = 3 32/42 = 3 16/21

4) 3 16/21 + 2 5/12 = 3 64/84 + 2 35/84 = 5 99/84 = 6 15/84 = 6 5/28

Ответ: 6 целых 5/28.