高考数学总复习核心突破集合与充要条件1.4集合与充要条件经典题型.pptx

Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,*,1.4 集合与充要条件经典题型,题型1,.,集合运算,1,.,已知集合,A=,1,3,4,5,B=,1,2,5,6,则,A,B=,(,),A.3,4,5,6 B.4,5 C.3,6 D.1,5,2,.,设集合,M=,0,1,N=,x|x=,2,a+,1,a,M,则,M,N=,(,),A.1,3 B.1 C.0,1 D.0,1,3,【答案】D,【答案】B,第1页,3,.,设集合,A=,x|x,1,B=,x|,0,x,0 B.,x|x,1,C.,x|x,0,或,x,1 D.,x|,1,x,0”,(),A.充分无须要条件 B.必要不充分条件,C.充分必要条件 D.既不充分也无须要条件,6,.,方程,ax,2,-bx+,2,=,0(,a,、,b,R,且,a,0),无实数解充分无须要条件是(),A.,b,2,-,8,a,0 B.,b,2,-,8,a-,1,C.,b,2,-,8,a=,0 D.,b,2,-,8,a,1,【答案】C,【答案】B,第3页,7,.,“,x,1”,是“,x,2,2”,是“,|a|,1”,(),A.充分无须要条件 B.必要不充分条件C.充分必要条件 D.既不充分也无须要条件,【答案】B,【答案】A,第4页,题型3,.,集合综合题,9,.,已知集合,A=,-,4,2,a-,1,a,2,B=,a-,5,1,-a,9,且,A,B=,9,求,a,值,.,解:,A=,-,4,2,a-,1,a,2,B=,a-,5,1,-a,9,且,A,B=,9,2,a-,1,=,9,或,a,2,=,9,a=,5,或,a=,3,.,当,a=,5,时,A=,-,4,9,25,B=,0,-,4,9,A,B=,-,4,9,与已知不符,舍去,.,当,a=-,3,时,A=,-,4,-,7,9,B=,-,8,4,9,A,B=,9,.,当,a=,3,时,B=,-,2,-,2,9,不符合集合元素互异性,舍去,.,总而言之:,a=-,3,.,第5页,