Răspuns :
a+b+c= 39
b =c+1
a =b+ 7
b+7 +b + b-1 = 39
3b +6 = 39
3b= 33
b= 11
a = 11+7 = 18
c=b-1 = 11-1 = 10
b =c+1
a =b+ 7
b+7 +b + b-1 = 39
3b +6 = 39
3b= 33
b= 11
a = 11+7 = 18
c=b-1 = 11-1 = 10
a+b+c=39
b=1+c
a=7+b
7+1+c+1+c+c=39
9+3*c=39
3*c=39-9
3*c=30 c=30/3 c=10
b=1+c
a=7+b
7+1+c+1+c+c=39
9+3*c=39
3*c=39-9
3*c=30 c=30/3 c=10