(x^2-9x+20)/(x-1)^2(x-5)>=0

热心网友

(x^2-9x+20)/(x-1)^2(x-5)=0 即(x-4)(x-5)/(x-1)^2(x-5)=0 即(x-4)/(x-1)^2 (x≠5) (x-4)≥0且(x-1)^20 (x≠5) 解得:x≥4且x≠1 (x≠5)即 4≤x5

热心网友

因为(x-1)^2>0,所以(x^2-9x+20)/(x-5)=0 →(x-4)(x-5)/(x-5)≥0(x≠5)所以(x-4)≥0,x≥4且x≠5