Question

Va rog ajutatima
Exercitiul 10

Answer 1

$\frac{AB}{AC} = \frac{4}{3} \\ \\ \frac{BC}{AB} = \frac{1}{4} \\ \\ \frac{AB}{AB-BC}= \frac{AB}{AC} = \frac{4}{3} \\ \\ \frac{AB-AC}{AB+BC}= \frac{BC}{4+1} = \frac{1}{5}$