关于x的不等式ax^2--(2a+1)x+a--1>=0的解集为空集,则实数a的取值范围是(请写过程)
人气：252 ℃ 时间：2019-11-04 09:51:44
解答
要使不等式的解集为空集,即就是这个不等式无解
则判别式小于零
b2-4ac
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