1.(x^2(x+3)^7(x-4)^3)/(x+1)^11（2x-1）^5(x+3)(x-4)/(x+1)（2x-1）(x+3)(x-4)(x+1)（2x-1）x在：[-3,-1)并(0.5,4]
2.(x^2-2X-3)(x^2-2x+1)(x-3)(x+1)(x-1)^2(x-3)(x+1) （-1,3）
3.(1/(x-3))+1>=1/x+1
->1/(x-3)>=1/x
->1/(x-3)-1/x>=0
->3/(x-3)x>=0
->(x-3)x>0
->x>3或者x(x^2-x-1)x>0->
0>x>（1-根号5）/2或者x>（1+根号5）/2