1.
а) 47/12 = 3 11/12
б) 13/4 = 3 1/4
2.
17 6/11 = 17*11+6/11 = 187+6/11 = 193/11
3.
11 2/5 - 3 1/5 - x = 2 4/5
57/5 - 16/5 - x = 14/5
41/5 - x = 14/5
-x = 14/5 - 41/5
-x = - 27/5 I:(-1)
x = 27/5
Ответ 27/5
2.
а) 2 1/7 + 3 5/7 = (2+3) + (1/7 + 5/7) = 5 + 6/7 = 5 6/7
б) 7 4/5 - 5 3/5 = (7-5) + (4/5 - 3/5) = 2 + 1/5 = 2 1/5
3.
8 2/5 + 6 4/5 - 3 3/5 - 4 2/5 = (8+6-3-4) + (2/5 + 4/5 - 3/5 - 2/5) = 7 + 1/5 = 7 1/5