Ta có: [tex]\left\{\begin{matrix} |A|+|B|+|C|=19\\ |A|+|E|+|G|+|D|=67\\ |B|+|E|+|G|+|F|=83\\ |C|+|D|+|G|+|F|=73\\ |A|+|B|+|C|+|D|+|E|+|F|+|G|=100 \end{matrix}\right.\Rightarrow \left\{\begin{matrix} 2(|E|+|F|+|D|)+3|G|=67+83+73-19=204\\ |E|+|F|+|G|+|D|=100-19=81 \end{matrix}\right.\Rightarrow |G|=204-2.81=42[/tex]
