(x-1)/x≥2(x-1)/x-2≥0(x-1)/x-2x/x≥0(-3x-1)/x≥0(3x+1)/x<=0(3x+1)x<=0-1/3<=x<=0因为分母不能为0，所以解集为-1/3<=x<0
(x-1)/x-2>=0(x-2)/x-2x/x>=0(-x-2)/x>=0(x+2)/x<=0x(x+2)<=0-2<=x<0
-1≤X≤0利用穿针引线法。
