Răspuns :
a+b+c=111
a=(b+c) :2 -> b+c=2a -> (b+c)/2 + b+c =111 -> 3b +3c =222 -> b+c=222/3=74
-> a=27
a=(b+c) :2 -> b+c=2a -> (b+c)/2 + b+c =111 -> 3b +3c =222 -> b+c=222/3=74
-> a=27