Réponses

2013-02-16T16:28:40+01:00

a)

AN = AC + CN

= 4/4 AC - 1/4 AC

= 3/4 AC

 

b)

MN = MA + AN

= -3/4 AB + 3/4 AC

= 3/4 (AC - AB)

 

3)

MN = = 3/4 (AC - AB)

= - 3/4 (CA + AB)

= -3/4 CB

= 3/4 BC

 

En espérant t'avoir aidé.