1) 1 7/8 - 3/4 + 3 5/8 = 4 12/8 - 6/8 = 4 6/8 = 4 3/4
2) 4/7 + 11/14 - 1 3/14 = 8/14 + 11/14 - 1 3/14 = 19/14 - 1 3/14 = 1 5/14 - 1 3/14 = 2/14 = 1/7
3) 8/19 • 4 3/4 = 8/19 • 19/4 = 2
4) 5/14 : 1/7 = 5/2 = 2,5
5) 2 + 2,5 = 4,5
Ответ 4,5 ( или 4 1/2 )