Resposta :
[tex]\boxed{P_{m} = (\frac{x_{a}+x_{b}}{2}; \frac{y_{a}+y_{b}}{2})}[/tex]
a) [tex]K(3;-4) \ \ \ \ L(2;-3) \\\\ P_{m} = (\frac{x_{k}+x_{l}}{2}; \frac{y_{k}+y_{l}}{2}) \\\\ P_{m} = (\frac{3+2}{2}; \frac{-3-4}{2}) \\\\ \boxed{\boxed{P_{m} = (\frac{5}{2}; \frac{-7}{2})} \ ou \ \boxed{(4,5; -3,5)}}[/tex]
[tex]M(5;-3) \ \ \ \ N(4;2) \\\\ P_{m} = (\frac{x_{m}+x_{n}}{2}; \frac{y_{m}+y_{n}}{2}) \\\\ P_{m} = (\frac{5+4}{2}; \frac{-3+2}{2}) \\\\ \boxed{\boxed{P_{m} = (\frac{9}{2}; \frac{-1}{2})} \ ou \ \boxed{4,5; -0,5}}[/tex]