45:5+54:6-(54+45):(k+5)=7
k trebuie sa dea 4.Dau coroana!!!


Răspuns :

=> 9+9-99:(k+5)=7
18-99:(k+5)=7 / -18
-99:(k+5)=-11
-99 supra k+5=-11
-11 ori (k+5)=-99/ :(-11)
k+5=9 /-5
k=4