Răspuns :
[tex] \frac{ab}{bd} = \frac{4}{3 + 5} = \frac{4}{8} = \frac{1}{2} \\ \frac{ac}{bc} = \frac{4 + 3}{3} = \frac{7}{3} \\ \frac{bd}{ad} = \frac{3 + 5}{4 + 3 + 5} = \frac{8}{12} = \frac{2}{3} [/tex]
[tex] \frac{ab}{bd} = \frac{4}{3 + 5} = \frac{4}{8} = \frac{1}{2} \\ \frac{ac}{bc} = \frac{4 + 3}{3} = \frac{7}{3} \\ \frac{bd}{ad} = \frac{3 + 5}{4 + 3 + 5} = \frac{8}{12} = \frac{2}{3} [/tex]