bjr
un exercice => CET exercice
désolée, çà pique :(
en vecteurs
PA = 5/3 x PB
on va "décomposer" PB en PA + AB
et on aura
PA = 5/3 (PA + AB)
soit
PA = 5/3PA + 5/3AB
PA - 5/3PA = 5/3AB
3/3PA - 5/3PA = 5/3AB
-2/3PA = 5/3AB
2/3AP = 5/3AB
AP = 5/3x3/2 AB
AP = 5/2 x AB
A 4 cm B 4cm ! 2 cm P
