plska pomóżcie......,....

Zad.1
-2 3/4-3 1/7=-(2 3/4+3 1/7)=-((2+3)+( 3/4+ 1/7))=-(5+(3/4+1/7))=-5 25/28
Zad.2
-3,7-2,1=-(3,7+2,1)=-5,8