四川省成都市高中数学第一章集合与函数第4课时全集与补集同步练习新人教A版必修1.doc

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1第 4 课时 全集与补集基础达标(水平一)1.已知全集 U=1,2,3,4,5,集合 A=1,2,B=2,3,4,则 B( UA)=( ).A.2 B.3,4C.1,4,5 D.2,3,4,5【解析】 UA=3,4,5,B( UA)=3,4.【答案】B2.已知全集 U=R,集合 A=x|-2 x3, B=x|x4,则集合 A( UB)等于( ).A.x|-2 x2 B.21, 00,B=x|x3.又因为 B( RA),所以当 B=时,应满足 m1 +3mm - ;12当 B时,应满足 或 解得 m3.1+3,3 1+3,1+3-1,综上所述, m3 或 m - .12

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