Réponses

2014-03-02T23:56:10+01:00
Bonsoir,

Utilisons la relation de colinéarité entre deux vecteurs 

1) (-8) * 2 - 8 * m = 0
-16 - 8m = 0
8m = -16
m = -16/8
m = -2

2) (-1) * 4m - 4 * 4 = 0
-4m - 16 = 0
-4m = 16
m = 16/(-4)
m = -4

3) (m-1) * (-2) - 2 * 3 = 0
-2m + 2 - 6 = 0
-2m = -2 + 4
-2m = 2
m = 2/(-2)
m = -1