Răspuns :
Ma=(a+b+c+d+e+f+g)/7
(a+b+c+d+e+f+g)/7=138
⇒(a+b+c+d+e+f+g)=138×7
⇒(a+b+c+d+e+f+g)=966
(a+b+c+d+e+f+g)/7=138
⇒(a+b+c+d+e+f+g)=138×7
⇒(a+b+c+d+e+f+g)=966