Réponses

  • Utilisateur Brainly
2014-04-12T10:37:04+02:00
n°55
a) 3x-2>x+5
2x>7
x>3,5

b) 2x-1/3 ≤ 3x-1/4
24x-4 ≤ 36x-3
-12x ≤ 1
x ≥ -1/12

n°56
a) 2x-5 ≤ 5x+7
-3x ≤ 12
x ≥ -4

b) 3(x-1)-2(4x-1) ≥ 0
-5x-1 ≥ 0
x ≤ -1/5

n°57
a) 2-(5-2t) > 3(2t-1)
2t-3>6t-3
-4t>0
t<0

b) 1/4(3x+1)<1/6(5x+1)
3(3x+1)<2(5x+1)
9x+3<10x+2
x>1