x/(x-1)-3/(x-1)(x+2)-1=((x*(x+2)-3-(x-1)(x+2))/(x-1)(x+2)=(x²+2x-3-x²-x+2)/(x-1)(x+2)=(x-1)/(x-1)(x+2)=1/(x+2)x+2≠0得:x≠-2祝您学习进步,生活愉快! 如果我的解答对你有帮助,一定要选为最佳答案鼓励我一下哦。