1.1.3 集合的基本运算(2)练习时间:40分钟,总分100分一、选择题: 1【易】已知集合U1,3,5,7,9,A1,5,7,则UA等于 ()A1,3 B3,7,9 C3,5,9 D3,92.【易】已知集合I=1,2,3,4,A=1,B=2,4,则A等于( )A.1 B.1,3 C. 3 D.1,2,33.【易】全集( )A. B. C. D.4.【易】设全集UR,集合Ax|x10,则UA是() Ax|x1 Bx|x-1 Cx|x1 Dx|x-15.【易】设集合Ax|1x4,集合Bx|1x3,则A(RB)等于 ()A x|1x4 B x|3x4Cx|1x3 D x|1x2或3x4二、填空题: 1.【易】已知,如果CUA1,那么的值为 .2.【易】已知集合A=x|x-2,则 = .3.【易】已知集合A=x|3x3,Bx|x2,则(RA)B_ _.4【难】已知全集,A(UB)1,3,5,7,试求集合5【难】已知全集UR,集合Ax|1x2,若B(RA)R,B(RA)x|0x1或2x3,求集合B.