(x - 1)/(x - 2) ≥ (x - 3)/(x - 4) mit x ≠ 2 und x ≠ 4
Fall 1: x < 2 oder x > 4
(x - 1)/(x - 2) ≥ (x - 3)/(x - 4)
(x - 1)·(x - 4) ≥ (x - 3)·(x - 2)
x^2 - 5·x + 4 ≥ x^2 - 5·x + 6
nie erfüllt
Fall 2: 2 < x < 4
(x - 1)/(x - 2) ≥ (x - 3)/(x - 4)
(x - 1)·(x - 4) ≤ (x - 3)·(x - 2)
x^2 - 5·x + 4 ≤ x^2 - 5·x + 6
immer erfüllt
--> 2 < x < 4