- 5/9 - 4=
-6 2/3-8 5/12=
-5/6-(8/15)=
-2 2/4-(1 7/15)=
​

Пошаговое объяснение:

- 5/9 - 4= - 4 5/9

-6 2/3-8 5/12= - 20/3 - 104/12=  - 80/12 - 104/12= - 184/12= - 15 4/12= - 15  1/3

-5/6-(8/15)= -25/30 - 16/30= - 41/30= - 1  11/30

-2 2/4-(1 7/15)= -10/4 - 22/15= - 150 /60 - 88/60= - 238/60= - 3 58/60=

- 3 29/30

- 5/9 - 4= -9,9

-6 2/3-8 5/12= -147,42

-5/6-(8/15)= 2,55

-2 2/4-(1 7/15)= -05,25