若关于x的不等式组
无解,则a的取值范围是( )
A. a<3
B. a>3
C. a≥3
D. a≤3
人气:348 ℃ 时间:2019-08-18 21:23:23
解答
∵不等式组
无解,
∴由①得:x≤3,
由②得:x>a,
∴a≥3.
故选C.
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