(四川专用)2018年高考数学(通用)二轮单项选择第1讲(含解析)1(2017天津)设集合A1,2,6,B2,4,CxR|1x5,则(AB)C(B)A2 B1,2,4C1,2,4,6 DxR|1x5解析(AB)C1,2,4,61,51,2,4,选B2函数y的定义域为(C)A(4,1) B(4,1)C(1,1) D(1,1解析要使f(x)有意义,需,解得1x1,Bx|x22x30,则AB(C)A(1,1) BRC(1,3 D(1,3解析由|x|1得x1或x1,又x22x30,1x3.ABx|1x3(1,3故选C12(2017贵州遵义联考)已知0,给出下列四个结论:ab;ab|b|;abb2其中正确结论的序号是(C)A BC D解析0ba0|a|b|,ab0ab.故选C