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caro67000
1.
a)2x-12 / 2x-4 = 5
2 (x-6) / 2 (x-2) = 5
x-6 / x-2 = 5
x-6 = 5 x - 10
4x = 4
x=1
b) (2x-12)/ (x-4) ≤ x+3
2(x-6)/(x-4) ≤ x+3
2 (x-6) / x-4 ≤ x+3
2(x-6) ≤ (x+3) * (x-4)
2 (x-6) ≤ (x² - 4x +3x - 12)
2 x - 12 ≤ x²-x -12
3x ≤ x²
3 ≤ x
et x ≥ 3


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