Răspuns :
a |______a_________| =27
b |______a_________||______a_________| =27+27=54
a+a+a=81
3xa=81
a=81:3
a=27
b=27+27
b=54
b |______a_________||______a_________| =27+27=54
a+a+a=81
3xa=81
a=81:3
a=27
b=27+27
b=54