решите,плес
а) 8/25-4/5
б) -5/18+2/3
в)5/6-3/8
г)-7/12-11/30
срочноо❤

8/25 - 4/5 = 8/25 - 20/25 = - 12/25 
- 5/18 + 2/3 = - 5/18 + 12/18 = 7/18 
5/6 - 3/8 = 20/24 - 9/24 = 11/24 
- 7/12 - 11/30 = - 35/60 - 22/60 = - 57/60 = - 19/20