Cho tam giác ABC có A (1; 2), B (-3; 5), C (1; 4), tìm M thuộc AB

$$\begin{gathered} \mathrm{cho} ∆\mathrm{ABC} \mathrm{có} \mathrm{A}(1,2) \mathrm{B}(-3,5) \mathrm{C}(1,4). \\ \mathrm{Tìm} \mathrm{M} \mathrm{thuộc} \mathrm{AB} \mathrm{để} \mathrm{chu} \mathrm{vi} ∆\mathrm{COM}\hspace{0.17em}\mathrm{mn} \end{gathered}$$