组卷网>知识点选题>分类讨论法解决元素与集合关系问题
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2 . 集合eqId639ad4933233481994053f1502e5df56的所有三个元素的子集记为eqId885a7719c39046cdb2e610be28775450.记eqId01f58fa476fd48b4b78e17b5afcef3a5为集合eqId30be105c473741d19704245066081eeaeqIdc28eeb9fd5f543bab0bb1e8b013fd18b中的最大元素,则eqIdf75e824f95434041bd355bdc4c3b56cf(   )
A.eqId62503849440740cf8754af7e844ba72cB.eqIdf24001beb51f46588ee57de268c2e297C.eqIdc15d343cecf74172a34fccfff78c1cd7D.eqIdd6c0e3ca15b3431487f3ef7f69c1d8a5
单选题 | 容易(0.94) |
3 . 以下四个关系:∅∈{0},0∈∅,{∅}eqIdb2f7663a44f6480aab967ac28584cba8{0},∅eqId86a97a1b687443cebf64e2c45a0ebdd4{0},其中正确的个数是(   )
A.1B.2C.3D.4
更新:2021/04/17组卷:266
4 . 集合eqId36fe65c695834186882564d7678be880中有且仅有一个元素,则实数a的值为(    )
A.1B.-1C.0D.2
5 . 已知非空集合eqIdf89cbd4cd03b4842a7723553d35e2f83,设集合eqIde315ed26d4344af392afa6debc1fd68beqId70ed22802b9c4772bf68ece00eff03a6.分别用eqId5dbf297a825345b289063178069e57e4eqId4342f28ab46940368b1f11cb4bc351a7eqIdc0252a6a0f2c48388e1cb6e3a26c0966表示集合eqId052844cae8574a8ab842c38a039baac0eqId51d8a094ee99497ea839941c67407d85eqIdf8ef9ec340b848fc8802eec4cf1a8b89中元素的个数,则下列说法不正确的是(   )
A.若eqId6dda1730d7d649f5be14594a09c799de,则eqId119b5a794a5a46f9909b3af29eb8a318B.若eqId6dda1730d7d649f5be14594a09c799de,则eqIdc6d813bea3d34b0c96abbe1779a89277
C.若eqId53a071e341f6456fb06155f828141c52,则eqId5002a4d8584c4a34ad8f840e8452a75a可能为18D.若eqId53a071e341f6456fb06155f828141c52,则eqId5002a4d8584c4a34ad8f840e8452a75a不可能为19
填空题 | 容易(0.94) |
6 . 已知集合A={a+2,(a+1)2a2+3a+3},且1∈A,则eqId6e56c190d11c41e8ab23e8c6d2325359的值为_________.
更新:2021/03/18组卷:509
填空题 | 较易(0.85) |
7 . 1Î{a2a−1,a,−1},则a的值是_________.
更新:2021/03/12组卷:146
8 . 已知集合eqId15adc6ee8d1b428fae5f03589a6bf0fdeqIddb76dd5ab04b4ddb94f487dc6b93b809,是否存在实数eqId70a27b6ddf6b478285353abb3b1f3741,使得eqId0548b261c89b4c92992ba98f0ebd35b4?若存在,试求实数eqId70a27b6ddf6b478285353abb3b1f3741的值;若不存在,请说明理由.
9 . 已知集合eqId838685128caf42bdb719e7b755c7517a,若eqId864a0dca24614d9fabdeafe68378f916,则eqIda4be99d332154d13a4a6ed1ff6444fe7的值为___________.
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