（3x^2-14x+14)/(x^2-6x+8)≥1
（3x^2-14x+14)/(x^2-6x+8)-1≥0
（3x^2-14x+14-x^2+6x-8)/(x^2-6x+8)≥0
(x^2-4x+3)/(x^2-6x+8)≥0
(x-1)(x-3)/(x-2)(x-4)≥0
得x≤1或24