设A ={1，3，5，7}，B = {5, 7, 9，11}，则A∪B是（）

【单选题】

设 A = {1, 22, 43, 3}，B = {1, 32, 44, 2}，则差关系A-B的域fld(A-B)等于：

① {1,3};

② {1,2,4};

③ {1,2,3};

④ {2,3}.

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【单选题】

① <img src=https://huaweicloudobs.ahjxjy.cn/D594462BB5C4164FDFA0944CF623912C.png title=7-1.png alt=7-1.png/>

② <img src=https://huaweicloudobs.ahjxjy.cn/FA4E04E7F344C8C36FF15B9BBC2795DF.png title=7-2.png alt=7-2.png/>

③ <img src=https://huaweicloudobs.ahjxjy.cn/ACF5C3328C49AA7DD6C0153DB71457B2.png title=7-3.png alt=7-3.png/>

④ <img src=https://huaweicloudobs.ahjxjy.cn/1B1EC4FA0924D60EA21B1C16BB9C9BF1.png title=7-4.png alt=7-4.png/>

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【单选题】

设 A = {1, 22, 43, 3}，B = {1, 32, 44, 2}，则并关系A∪B的定义域dom(A∪B)等于：

① {1,2,3};

② {1,2,3,4};

③ {2,3,4};

④ {3,4,2}.

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【单选题】

① <img src=https://huaweicloudobs.ahjxjy.cn/105E33D043DE43212EE93C0F4F51024D.png title=7-1.png alt=7-1.png/>

② <img src=https://huaweicloudobs.ahjxjy.cn/329846DC72CE725CC2D0807F077CC479.png title=7-2.png alt=7-2.png/>

③ <img src=https://huaweicloudobs.ahjxjy.cn/AAFE6581F59379576146F41CF442D822.png title=7-3.png alt=7-3.png/>

④ <img src=https://huaweicloudobs.ahjxjy.cn/6826E117B65467CB2800E91808A07D25.png title=7-4.png alt=7-4.png/>

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【单选题】

<imgsrc="http://121.251.253.213/doc/a@F4481B790DEA53F8BA784340D9E7DBD5.png/download?time=636002471591908737&token=C9861E965BE2A3F88E19FDB83A015858&filename=png"data-url="doc/a@F4481B790DEA53F8BA784340D9E7DBD5.png"data-preview_url_ueditor="doc/a@F4481B790DEA53F8BA784340D9E7DBD5.png"/>

① <imgsrc="http://121.251.253.213/doc/a@49AD58B83D74079A52B9BC9D580A57F0.png/download?time=636002471674588883&token=5D0CC3E9D5071B5B99D33E11198168CF&filename=png"data-url="doc/a@49AD58B83D74079A52B9BC9D580A57F0.png"data-preview_url_ueditor="doc/a@49AD58B83D74079A52B9BC9D580A57F0.png"/>

② <imgsrc="http://121.251.253.213/doc/a@7EFC8C78A5255FC23D2408BA7460C4B1.png/download?time=636002471771153052&token=C4DD6005C7D6AB83CC98365C90E96F7F&filename=png"data-url="doc/a@7EFC8C78A5255FC23D2408BA7460C4B1.png"data-preview_url_ueditor="doc/a@7EFC8C78A5255FC23D2408BA7460C4B1.png"/>

③ <imgsrc="http://121.251.253.213/doc/a@08C1F1E9561C37C7D96249E0FF936B6A.png/download?time=636002471855705201&token=48F4A7689592EAC7AC51D4A9DC7C61E9&filename=png"data-url="doc/a@08C1F1E9561C37C7D96249E0FF936B6A.png"data-preview_url_ueditor="doc/a@08C1F1E9561C37C7D96249E0FF936B6A.png"/>

④ <imgsrc="http://121.251.253.213/doc/a@33BDC224DA6CE3012ADE43A9FC77D6D6.png/download?time=636002471973797408&token=349E4644A1E20C4BDE3E18EC7BF17375&filename=png"data-url="doc/a@33BDC224DA6CE3012ADE43A9FC77D6D6.png"data-preview_url_ueditor="doc/a@33BDC224DA6CE3012ADE43A9FC77D6D6.png"/>

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【简答题】

设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则对称差关系A⊕B等于：[填空1]

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【单选题】

① <img src=https://huaweicloudobs.ahjxjy.cn/4B539B66EED348DA53E6E18138EBBB0D.jpg style=vertical-align: middle;/>

② <img src=https://huaweicloudobs.ahjxjy.cn/776B0772CFF62D1761F9D140A99BC667.jpg style=vertical-align: middle;/>

③ <img src=https://huaweicloudobs.ahjxjy.cn/8DEDF8DE66C680ABBA0ADE23027B0784.jpg style=vertical-align: middle;/>

④ <img src=https://huaweicloudobs.ahjxjy.cn/BD73F037CB86326014AE94C868450FBB.jpg style=vertical-align: middle;/>

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【单选题】

① 1/3

② -1/3

③ 3

④ -3

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【单选题】

设<img src=https://huaweicloudobs.ahjxjy.cn/5D1F115A7B3D10DD50549ABE40CCD671.png title=VR05(N8[1W}[SL9O)`{%O_K.png alt=VR05(N8[1W}[SL9O)`{%O_K.png/>，则<img src=https://huaweicloudobs.ahjxjy.cn/26D23506B7384063E7F94FADDDBAA396.png title=CIBLCZSFPZZ0J]%KD`B5ZYX.png alt=CIBLCZSFPZZ0J]%KD`B5ZYX.png/>

① 可导

② 连续但不可导

③ 不连续

④ 无定义

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【单选题】

当a=1,b=3,c=5,d=4,执行完下面一段程序后x的值是:ifa<b)ifc<d)x=1;elseifa<c)ifb<d)x=2;elsex=3;elsex=6;elsex=7

① 18

② 2

③ 3

④ 6

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