内分点、外分点（複素平面）

${\displaystyle {\gamma }_1=\alpha +\frac{2}{2+1}\left(\beta -\alpha \right)}$

${\displaystyle =\left(1+3i\right)+\frac{2}{3}\left\{\left(4+2i\right)-\left(1+3i\right)\right\}}$

${\displaystyle =1+3i+\frac{2}{3}\left(3-i\right)}$

${\displaystyle =3+\frac{7}{3}i}$

${\displaystyle {\gamma }_2=\alpha +\frac{3}{3-2}\left(\beta -\alpha \right)}$

${\displaystyle =\left(1+3i\right)+3\left\{\left(4+2i\right)-\left(1+3i\right)\right\}}$

${\displaystyle =1+3i+3\left(3-i\right)}$

${\displaystyle =10}$

${\displaystyle {\gamma }_3=\alpha +\frac{3-2}{1-3}\left(\beta -\alpha \right)}$

${\displaystyle =\left(1+3i\right)-\frac{1}{2}\left\{\left(4+2i\right)-\left(1+3i\right)\right\}}$

${\displaystyle =1+3i-\frac{1}{2}\left(3-i\right)}$

${\displaystyle =-\frac{1}{2}+\frac{7}{2}i}$