1 . 给出下列命题:
①“若
,则
”的逆命题为“若
,则
”;
②“
,
”的否定是“
,
”;
③命题“若
,则
”的否命题为“若
,则
”;
④“若
,则a,b全为0”的逆否命题是“若a,b全不为0,则
”.
其中正确的命题序号是( )
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef019ee5c3eff526b479ba9482e8a16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef019ee5c3eff526b479ba9482e8a16b.png)
②“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6422b9c2e93a91fe9e39ce4d9dabb0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f139b44eadf675a59e0f4e880b82b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045748e3e58bfc29cf00ea0b80d2d56b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f19a99bb30f18352b45a93ffa8533c1.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfa8bf45e6d2d25a730a793d0cf5694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb20e291772c2614ad19f4cc919dfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a68dbd91d6de68b550a5745ecd461d9.png)
其中正确的命题序号是( )
A.①② | B.①③ | C.②④ | D.③④ |
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3卷引用:江西2023届高三联合测评卷数学(文)试题
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2 . 设
,下列四个命题中真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80066bef1503e7b20232e9622847547a.png)
A.“若![]() ![]() | B.“若![]() ![]() |
C.若![]() ![]() ![]() | D.“若![]() ![]() |
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3 . 下列说法正确的是( )
A.“若![]() ![]() ![]() ![]() ![]() ![]() |
B.“若方程![]() ![]() |
C.命题“![]() ![]() ![]() ![]() |
D.“![]() ![]() ![]() |
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2卷引用:江西省南昌市湾里一中等六校2021-2022学年高二上学期期末数学(文)试题
4 . 对于下列说法正确的是( )
A.命题“若![]() ![]() |
B.命题“若![]() ![]() |
C.命题 “设![]() ![]() ![]() |
D.命题“若![]() ![]() |
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5 . 下列说法正确的个数为( )
①命题“若
则
”的逆命题为真命题;
②命题“若
且
,则
”的否命题为真命题;
③存在
,使得
;
④若正数
、
满足
,则
恒成立.
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b702b9c4b5cf145dbac9abfeb1ed500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200849ce71f53c0321506e27de437b8d.png)
②命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc34a2d14b2f914017ae7b2a15ab60e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc94875835baa1d3c78b93a9ba46185.png)
③存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799b324b514d6044672c133d8fef2dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eacc1bc98910bff2e05e7f94c593205b.png)
④若正数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa1603dda1c5dc2c93b06688c2e9c04.png)
A.1 | B.2 | C.3 | D.4 |
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6 . 给出下列结论
①命题“若
,则
”的逆否命题为“若
,则
”
②命题“
,
”的否定形式是“
,
或
”
③命题“若
,则方程
有实根”的逆命题为真命题
④
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be91c54832cbb241b6a32cb0fab85825.png)
其中正确结论的个数是( )
①命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3898b62d3fbcb61afb6bc1e9b910f564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad2b31cfb9939e45bdb29af8139af06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca3f71ef36362c0796365275a86eb0c.png)
②命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23772c1f69cc492f45b238a00535fa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66d61d5f66d68b4c4a2a25fd7103621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79d5a0e25aebe1cc182d2247ed344652.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4c78214e43a8b93f2a57072033cbcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be91c54832cbb241b6a32cb0fab85825.png)
其中正确结论的个数是( )
A.1 | B.2 | C.3 | D.4 |
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7 . 下列结论错误的是( )
A.若“p且q”与“![]() ![]() ![]() |
B.命题“存在![]() ![]() ![]() ![]() ![]() |
C.“若![]() ![]() |
D.“![]() ![]() |
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3卷引用:江西省南昌市第十中学2020-2021学年高二上学期期末考试数学(理)试题
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8 . 对于命题“若方程
为椭圆方程,则
”,下列说法正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60e3a9c8c31ba3f0a3231d86499c40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e701bab996f8add74a2d75b3b6a5c49.png)
A.逆否命题为真 | B.逆命题为真 | C.否命题为真 | D.命题的否定为真 |
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9 . 下列命题错误的是( )
A.“![]() ![]() |
B.若等比数列![]() ![]() ![]() |
C.在![]() ![]() ![]() |
D.命题“若![]() ![]() |
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10 . 有下列四个命题:①“若
,则
,
互为倒数”的逆命题;②“面积相等的三角形全等”的否命题;③命题“若
,则
”的逆否命题;④“若
,则方程
有实数解”的逆否命题;其中真命题个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377a2333ff8c63cbdb20b882d6d5a7ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850f6874ea501c6021573701b0294dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347c62b44fae618a37c145b3b5d1f1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5707186257494f1fea86066f2778b5.png)
A.1 | B.2 | C.3 | D.4 |
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