Question

Care este rezolvarea la prima problema.

Answer 1

deoarece MN||BC ⇒ΔAMN≈ΔABC si putem spune ca
AM/AB=AN/AC=MN/BC
daca din ipoteza
AM/AB=1/5⇒AM/AB=AN/AC=1/5
deci AN/AC=1/5

NC/AN=?
NC=AC-AN
(AC-AN)/AN=AC/AN-AN/AN=AC/AN-1=
AN/AC=1/5 ⇒AC/AN=5 ⇒
NC/AN=5-1=4