Question

Va rog mult ajutatima la exercitiul 4

Answer 1

MN||BC => (teorema lui Thales) AM/AB=AN/AC (1)
AB=AC (2)
(1)+(2) = >AM=AN

AM/AB=AN/AC => 1-AM/AB=1-AN/AC => AB/AB-AM/AB=AC/AC-AN/AC
=> (AB-AM)/AB=(AC-AN)/AC => MB/AB=NC/AC => MB=NC