Ответ:

1. 1  1/10

2. -3

3. 1/9

4. 0

Пошаговое объяснение:

1. 3 4/15 - 2 1/8 - 1/24 =  49/15 - 17/18 - 1/24 = (49*8-17*15-5*1)/120 =

(392-255-5)/120 = 132/120 = 1 1/10

2. -3 - 2 2/3 - 4 5/6 + 7 1/2 = -5 2/3 - 4 5/6 + 7 1/2 = -17/3 - 29/6 + 15/2 =

(-17*2-29+15*3)/6 = (-34-29+45)/6 = -18/6 = -3

3. 1 5/6 - 2 5/9 + 4 1/3 - 3 1/2 = 11/6 - 23/9 + 13/3 - 7/2 =

(11*3-23*2+13*6-7*9)/18 = (33-46+78-63)/18 = 2/18 = 1/9

4. 0,25 - 7/12 + 0,5 - 1/6 = 1/4 - 7/12 + 1/2 - 1/6 = (1*3-7+1*6-1*2)/12 =

(3-7+6-2)/12 = 0/12 = 0