∵(3-x)/(x+1)≥0∴(3-x)(x+1)≥0(x-3)(x+1)≤0∴-1≤x<3∵x+1≠0∴x≠-1∴-1谢谢~_~
（3-x)/(x+1)≥0（3-x)(x+1)≥0且x+1≠0（x-3)(x+1)≤0且x+1≠0 -3≤x<-1
-1
-1≤X≤3
