Question

2xa+2xb+2xc=114 , stiind ca a+b=26 si b+c=42 calculati valoarea expresiei "(b+c):6+a:3=?

Answer 1

2·a+2·b+2·c=114
2·a+2·(b+c)=114, inlocuim b+c cu 42
2·a+2·42=114
2·a+84=114
2·a=114-84
2·a=30
a=30:2
a=15

(b+c):6+a:3=42:6+15:3=7+5=12
Raspuns: 12