Question

Determinați valoarea expresiei :
E= 3 a + 8 b + 6 c , știind ca a + 2 b = b + 3 c =4;2

Answer 1

E=3a+6b+2b+6c=3(a+2b)+2(b+3c)=3(b+3c)+2·4,2=3·4,2+8,4=12,6+8,4=21
E=21