2 целых 4/13+1 целая 2/13=

2 4/13 + 1 2/13 = 2 + 1 + 4/13 + 2/13 = 3 + (4 + 2) / 13 = 3 + 6/13 = 3 6/13.

Решим для закрепления подобные примеры:

1) 3 6/17 + 4 8/17 = 3 + 4 + 6/17 + 8/17 = 7 + (6 + 8) / 17 = 7 + 14/17 = 7 14/17.

2) 2 5/19 + 7 6/19 = 2 + 7 + 5/19 + 6/19 = 9 + (5 + 6) / 19 = 9 + 11/19 = 9 11/19.

3) 1 9/23 + 5 14/23 = 1 + 5 + 9/23 + 14/23 = 6 + (9 + 14) / 23 = 6 + 23/23 = 6 + 1 = 7.

4) 5 5/11 - 3 7/11 = 5 - 3 + 5/11 - 7/11 = 2 + (5 - 7) / 11 = 2 - 2/11 = 1 + 1 - 2/11 = 1 + 11/11 - 2/11 = 1 + (11 - 2) / 11 = 1 + 9/11 = 1 9/11.