Ответ:

4

Пошаговое объяснение:

-(3,78-5 4/9)-(0,22-2 5/9)=

= - (3 78/100-49/9)-(22/100-23/9)=

= - (3 39/50-49/9)-(11/50-23/9)=

= - (189/50-49/9) -(11/50-23/9) =

= - (1701/450-2450/450)-(99/450-1150/450)=

= - (-749/450) -(-1051/450)=

= 749/450+1051/450=1800/450=4