Réponses

2014-10-06T18:28:14+02:00
Soit M(x;y)
 A soit le milieu de [BM] : (2;7) = ((x+3)/2;(y+5)/2)
(x+3)/2 = 2 => x+3 = 4 => x = 1
(y+5)/2 = 7 => y+5 = 14 => y = 9
M(1;9)

 B soit le milieu de [AM]
(3;5) = ((x+2)/2;(y+7)/2) 
x+2 = 6 => x = 4
y+7 = 10 => y = 3
M(4;3)