calculati in modul cel mai ifecient
-3.72+5.26+2.72 (0.39-10.56)+10.56 -3.78+9.84+1.78-20.84
-3.72+5.26+2.72=4,26
(0.39-10.56)+10.56=0,39
-3.78+9.84+1.78-20.84 =13