Bonsoir,
11:
1. -3x<= 5x+1
-3x-5x<=1
-8x<=1
x<=1/-8
2. 2x=>-2/3
x=> (-2/3)/2
x=>-1/3
3. (7/3)x=>-1
(7/3)x * (3/7) => (3/7) * (-1)
x=> 3/7 * (-1)
x=> -3/7
4. (-4/5)x < 2/5
(-4/5)x * (-5/4) < (-5/4) * 2/5
x < -5/4 * 2/5
x < -1/4 * 2
x < -1/2
12:
1. -5x>-10
x > -10/-5
x > 10/5
x > 2
2. 6 + x <= 0,9x
x-0,9x <= -6
0.1x <= -6
x <= -6/0.1
x <= -60
3. 7x>0
x > 0/7
x > 0
4. 3x+4<7
3x < 7-4
3x < 3
x < 3/3
x < 1
5. -2x+1 => 3
-2x => 3-1
-2x => 2
x => 2/-2
x => -1
J’espère avoir pu aider, bonne continuation.
