【单选题】
设个体域是整数集,则下列命题的真值为真的是( )
①
<imgwidth="9"height="13"src="../uploadfiles/word/lsss001.files/image050.png">y<imgwidth="9"height="11"src="../uploadfiles/word/lsss001.files/image051.png">x(x·y=1)
②
<imgwidth="9"height="11"src="../uploadfiles/word/lsss001.files/image051.png">x<imgwidth="9"height="13"src="../uploadfiles/word/lsss001.files/image050.png">y(x·y≠0)
③
<imgwidth="97"height="19"src="../uploadfiles/word/lsss001.files/image054.png">
④
<imgwidth="91"height="22"src="../uploadfiles/word/lsss001.files/image055.png">
【单选题】
设M(x):x是人;F(x):x要吃饭。用谓词公式表达下述命题:所有的人都要吃饭,其中错误的表达式是( )
①
<imgwidth="118"height="20"src="../uploadfiles/word/lsss001.files/image015.png">
②
<imgwidth="128"height="20"src="../uploadfiles/word/lsss001.files/image016.png">
③
<imgwidth="111"height="20"src="../uploadfiles/word/lsss001.files/image017.png">
④
<imgwidth="122"height="20"src="../uploadfiles/word/lsss001.files/image018.png">
【单选题】
设A={{1,2,3},{4,5},{6,7,8}},下列选项正确的是( )
②
{1,2,3}<imgwidth="15"height="15"src="../uploadfiles/word/lsss002.files/image038.png">A
③
{{4,5}}<imgwidth="15"height="12"src="../uploadfiles/word/lsss002.files/image039.png">A
④
<imgwidth="16"height="17"src="../uploadfiles/word/lsss002.files/image040.png">∈A
【单选题】
设A是正整数集,R={(x,y)|x,y∈A∧x+3y=12},则R∩({2,3,4,6}×{2,3,4,6})=()
①
<imgwidth="16"height="16"src="../uploadfiles/word/lsss001.files/image010.png">
【单选题】
下列命题正确的是()
①
{l,2}<imgwidth="15"height="15"src="../uploadfiles/word/lsss001.files/image011.png">{{1,2},{l,2,3},1}
②
{1,2}<imgwidth="15"height="15"src="../uploadfiles/word/lsss001.files/image011.png">{1,{l,2},{l,2,3},2}
③
{1,2}<imgwidth="15"height="15"src="../uploadfiles/word/lsss001.files/image011.png">{{1},{2},{1,2}}
④
{1,2}∈{1,2,{2},{l,2,3}}
【判断题】
具有<imgwidth="17"height="15"v:shapes="对象_x0020_33"src="http://wljy.whut.edu.cn:80/uploadfiles/word/lssxpdt.files/image031.png">条边的连通图最多具有<imgwidth="36"height="19"v:shapes="对象_x0020_34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/lssxpdt.files/image033.png">个结点。
【单选题】
下列命题联结词集合中,是最小联结词组的是( )
①
{┐,<imgwidth="20"height="11"style="-aw-left-pos:0pt;-aw-rel-hpos:character;-aw-rel-vpos:line;-aw-top-pos:0pt;-aw-wrap-type:inline"src="../uploadfiles/word/lsss001.files/image077.png">}
【单选题】
下列函数中为双射的是( )
②
f:N→N,f(j)=<imgwidth="71"height="46"src="../uploadfiles/word/lsss002.files/image007.png">
【单选题】
设A(x):x是人,B(x):x犯错误,命题“没有不犯错误的人”符号化为( )
①
<imgwidth="98"height="20"src="../uploadfiles/word/lsss002.files/image014.png">
②
┐<imgwidth="68"height="20"src="../uploadfiles/word/lsss002.files/image015.png">┐B(x))
③
┐<imgwidth="96"height="20"src="../uploadfiles/word/lsss002.files/image016.png">
④
┐<imgwidth="63"height="20"src="../uploadfiles/word/lsss002.files/image017.png">┐B(x))
【单选题】
设<imgwidth="50"height="17"src="http://wljy.whut.edu.cn//uploadfiles/word/lsss002.files/image018.png">,则有( )
①
<imgwidth="35"height="16"src="../uploadfiles/word/lsss002.files/image019.png">
②
<imgwidth="37"height="18"src="../uploadfiles/word/lsss002.files/image020.png">
③
<imgwidth="37"height="19"src="../uploadfiles/word/lsss002.files/image021.png">
④
<imgwidth="38"height="20"src="../uploadfiles/word/lsss002.files/image022.png">