Răspuns :
[tex]\it \overline{AM}=\overline{AB}+\overline{BM}=\overline{AB}+\dfrac{1}{3}\overline{BC}=\overline{AB}+\dfrac{1}{3}(\overline{AC}-\overline{AB})=\dfrac{2}{3}\overline{AB}+\dfrac{1}{3}\overline{AC}[/tex]
[tex]\it \overline{AM}=\overline{AB}+\overline{BM}=\overline{AB}+\dfrac{1}{3}\overline{BC}=\overline{AB}+\dfrac{1}{3}(\overline{AC}-\overline{AB})=\dfrac{2}{3}\overline{AB}+\dfrac{1}{3}\overline{AC}[/tex]