№1.
а) 2 3/14 + 1 13/14 = 3 + 16/14 = 3 + 1 2/14 = 4 2/14 = 4 1/7
б) 5 9/16 + 3 11/16 = 9 4/16 = 9 1/4
в) 4 7/8 + 1 5/8 = 6 4/8 = 6 1/2
№2.
а) 8 - 3/4 = (7 + 4/4) - 3/4 = 7 1/4
б) 12 - 5 7/9 = 6 2/9
в) 6 2/5 - 4 3/5 =1 4/5
№3.
5 3/11 + 2 4/11 - 3 8/11 = 7 7/11 - 3 8/11 = 3 10/11
№4.
12 - 5 3/4 - 7/12 = 6 1/4 - 7/12 = 6 3/12 - 7/12=
= 5 8/12 = 5 1/3
№5.
2 4/15 + 3 13/15 = 5 + 1 2/15 = 6 2/15
14 7/9 - 8 8/9 = 5 8/9
6 2/15 > 5 8/9 ⇒ (2 4/15 + 3 13/15) > ( 14 7/9 - 8 8/9)