👤

Calcullati valoarea expresiei:    E=a+4b+5c-719 , daca a+6b =2b+c iar c=120


Răspuns :

a+6b =2b+c
a+6b-2b=c
a+4b=c=120
E=a+4b+5c-719
E=120+5x120-719
E=120+600-719
E=720-719
E=1