Réponses

2014-09-28T11:09:14+02:00
1) 11x-3=2x+9 
9x = 12
x = 4/3

2) x/7 =7/4 
x =49/4
x = 12.25

3) (-2x-5)(3x+2) 
-6x² -4x -15x -10
-6x² -19x -10

4) x²=50
x = 
√50 ou -√50