а) 17.24 + ( 7.9 - 9.14 ) = 16
7.9 - 9.14 = - 1.24
17.24 - 1.24 = 16
б) 24.16 - ( 3.9 - 14.74) = 35
3.9 - 14.74 = - 10.84
24.16 - ( - 10.84) = 24.16 + 10.84 = 35
в) - 1.8 + ( - 3 1/7 - 5.2) = - 10 1/7
- 3 1/7 - 5.2 = - 3 1/7 - 5 1/5 = - 8 12/35
- 1.8 + ( - 8 12/35) = - 1 4/5 - 8 12/35 = - 10 1/7
г) - ( 9 4/13 + 3 5/26) + 6 4/13 =
9 4/,13 + 3 5,/26 = 12 1/2
- 12 1/2 + 6 4/13 = - 6 5/26