№448.
- 6 2/3 - 8,75 - 2 5/12 = - 6 2/3 - 8 3/4 - 2 5/12 =
= - (6 8/12 + 8 9/12 + 2 5/12) = - (16 + 22/12) =
= - (16 + 1 5/6 ) = - 17 5/6
-3 7/15 - 0,4 - 6 1/3 = - 3 7/15 - 2/5 - 6 1/3 =
= - ( 3 7/15 + 6/15 + 6 5/15 ) = - ( 9 + 18/15 ) =
= - ( 9 + 1,2) = - 10,2
-1,5 - 3 4/5 - 8 3/20 = - (1,5 + 3,8 + 8,15) =
= - 13,45
- 2 5/8 - 9,25 - 3/4 = - ( 2,625 + 9,25 + 0,75) =
= - 12,625