57.4-(8.36+2.44)= 76.38+9.62-17.57= 8.4-(5.1704-(0.56-0.203))= 4.5+(40-(37-3.02))=

1)57,4-(8,36+2,44)=57,4-10,8=46,6
2)76,38+9,62-17,57=68,43
3)8,4-(5,1704-(0,56-0,203))=8,4-(5,1704-0,357)=8,4-4,8134=3,5866
4)4,5+(40-(37-3.02))= 4,5+6,02=10,52