bonjour
a) 3.3 ≤ 4.2 x + 1.7
- 4.2 x ≤ 1.7 - 3.3
- 4.2 x ≤ - 1.6
x ≥ 16/42 donc faux
b) - 3.5 ≥ - 2 x + 4.4
2 x ≥ 4.4 + 3.5
2 x ≥ 7.9
x ≥ 3.95
c) - 0.8 x ≤ - 6.9 + 5
- 0.8 x ≤ - 1.9
x ≥ 2.375
d) - 6 .5 x - 4.7 x ≥ 11 - 6.4
- 11.2 x ≥ 4.6
x ≤ 0.41
je te laisse finir