已知x和y满足约束条件y≥0x+2y+1<0x+y+2>0则y-2x-1的取值范 发布时间:2017-05-12 04:03 │ 来源:www.tikuol.com 题型:填空题 问题: 已知x和y满足约束条件y≥0x+2y+1<0x+y+2>0 则y-2x-1的取值范围为______.