Sagot :
Bonjour,
a) 3x +5 < 5x - 10
5+10 < 5x -3x
15 < 2x
x > 15/2
x > 7,5
b) 12x -7 < 10x + 3
12x-10x < 3+7
2x < 10
x < 10/2
x < 5
Bonjour,
Résoudre:
a) 3x +5 < 5x - 10
3x-5x < -10-5
-2x < -15
x > 15/2
S= ] 15/2; +∞ [
b) 12x -7 < 10x + 3
12x-10x < 3+7
x < 10/2
x < 5
S= ] -∞; 5 [