Ответ:

1) 3 1/8 - (4 5/16 + 1 1/4) = -2 7/16

1) 4 5/16 + 1 1/4 = 4 5/16 + 1 4/16 = 5 9/16

2) 3 1/8 - 5 9/16 = 3 2/16 - 5 9/16 = -2 7/16

2) -7 3/5 - ( - 4 1/15 - 5 2/3)

-(- ВСЕГДА ОБРАЗУЕТ ПЛЮС, значит:

-7 3/5 + 4 1/15 - 5 2/3 = 9 1/5

1) -7 9/15 + 4 1/15 - 5 10/15 = -3 8/15 - 5 10/15 = 8 18/15 = 9 3/15 = 9 1/5

3) -3 1/2 - (5 3/4 + 2 7/20) = -11 3/5

- 3 10/20 - ( 5 15/20 + 2 7/20) = -3 10/20 - 8 2/20 = - 11 12/20 = -11 3/5

4)-1/3 - ( - 3 7/18 - 5 8/9) = -1/3 + 3 718 - 5 8/9 = -2 5/6

-6/18 + 3 7/18 - 5 16/18 = 3 1/18 - 5 16/18 = -2 15/18 = -2 5/6