Bonsoir,
a)
-12x-3x < -2
-15x <-2
x < -2/-15
x < 2/15
b)
5x-2x ≤ 1 -2,3
3x ≤ -1,3
x ≤ -1,3/3
c)
3x/2 +2x ≥ 4/3 -2
3x/2 +4x/2 ≥4/3 - 6/3
7x/2 ≥ -2/3
7x ≥ -2/3 *2
7x ≥ -4/3
x ≥ ( -4/3) /7
x ≥ -4/3 * 1/7
x≥ - 4/21
d) -5 +3 < x +2x
-2 < 3x
x > -2/3
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Bonsoir,
a)
-12x-3x < -2
-15x <-2
x < -2/-15
x < 2/15
b)
5x-2x ≤ 1 -2,3
3x ≤ -1,3
x ≤ -1,3/3
c)
3x/2 +2x ≥ 4/3 -2
3x/2 +4x/2 ≥4/3 - 6/3
7x/2 ≥ -2/3
7x ≥ -2/3 *2
7x ≥ -4/3
x ≥ ( -4/3) /7
x ≥ -4/3 * 1/7
x≥ - 4/21
d) -5 +3 < x +2x
-2 < 3x
x > -2/3