x^2-3x-4/x^2+3x-10≥1
[x^2-3x-4]/[x^2+3x-10]-1≥0
(x^2-3x-4-x^2-3x+10)/(x^2+3x-10)>=0
(-6x+6)/(x+5)(x-2)>=0
(6x-6)/(x+5)*(x-2)<=0
通过"穿针引线"得到解集是{x|x<-5,1<=x<2}