名校
1 . 下列5个命题:①“
,
”的否定;②
是
的必要条件;③“若
,
都是偶数,则
是偶数”的逆命题;④“若
,则
”的否命题;⑤
是无理数
,
是无理数.其中假命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/838caf5f47c6c4a12de52ee4420264d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301c3d4cbe02776b719e0f0406db38c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa3205b1df826d63914dcb55bb3ab43.png)
![](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/20d6fc9b90f370fbb27552876b650f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fdf7d28b97fb6fe731703f80e122ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f194d0be8e14c0dfa0f0e33dc159673c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ca8bdc812627d925f00ed7c145d696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d800f03de80068a1172beac3a2c75587.png)
A.1 | B.2 | C.3 | D.以上答案都不对 |
您最近一年使用:0次
2 . 数列
对任意
,且
,均存在正整数
,满足
.
(1)求
可能值;
(2)命题p:若
成等差数列,则
,证明p为真,同时写出p逆命题q,并判断命题q是真是假,说明理由:
(3)若
成立,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c703ace0d2c22dd947a19d8afc74eac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9f79b02c30f810f7d9c661fa7e44c7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
(2)命题p:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b39cb7d4efd2dd15a1f39ac6ef72c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b30bfc8674948c31b09f824402ebada.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3557b9d9ef8529d963d2cd5962add5e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
名校
3 . 命题“
,则
”及其逆命题、否命题和逆否命题这四个命题中,真命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825893f68bb66b90d6f59b0cebf269b9.png)
A.0 | B.2 | C.3 | D.4 |
您最近一年使用:0次
2022-03-29更新
|
823次组卷
|
5卷引用:考点02 简易逻辑(文理)
名校
4 . 已知命题“若
,则
”,在它的逆命题、否命题、逆否命题中,真命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c513ff1e3c65aed38c7b91ebf6f96e4.png)
A.0个 | B.1个 | C.2个 | D.3个 |
您最近一年使用:0次
2021-12-13更新
|
768次组卷
|
3卷引用:专题1-2 简易逻辑题型归类-3
2022高三·全国·专题练习
解题方法
5 . 已知:命题“若函数
在
上是增函数,则m≤1,则
①否命题是“若函数
在
上是减函数,则m>1,”,是真命题;
②逆命题是“若m≤1,则函数
在
上是增函数”,是假命题;
③逆否命题是“若m>1,则函数
在
上是减函数”,是真命题;
④逆否命题是“若m>1,则函数
在
上不是增函数”,是真命题.
其中正确结论的序号是___________ .(填上所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2811f486076edd7e1940ab4b273fc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
①否命题是“若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2811f486076edd7e1940ab4b273fc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
②逆命题是“若m≤1,则函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2811f486076edd7e1940ab4b273fc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
③逆否命题是“若m>1,则函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2811f486076edd7e1940ab4b273fc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
④逆否命题是“若m>1,则函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2811f486076edd7e1940ab4b273fc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
其中正确结论的序号是
您最近一年使用:0次
名校
6 . 命题:“若a<0时,则一元二次方程x2+x+a=0有实根”与其逆命题、否命题、逆否命题中真命题的个数是( )
A.0 | B.2 | C.4 | D.不确定 |
您最近一年使用:0次
7 . 原命题为“若
,则
”,在原命题及其逆命题、否命题、逆否命题这
个命题中,假命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0cee165c7a747253e69ab1a6e6a7076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021高三·全国·专题练习
解题方法
8 . 已知动圆过定点
,且在
轴上截得的弦长为
,动圆圆心的轨迹方程为
,命题“如果直线
过点
且与轨迹
交于
、
两点,那么
恒成立”,写命题的逆命题,判断它是真命题还是假命题,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63309dbc3612815f6dbdee23d9a10adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e77a2865ee0a885848caf8888a0bc389.png)
您最近一年使用:0次
9 . 下列四个结论:①设
为向量,若
,则
恒成立;②命题“若
,则
”的逆命题为“若
,则
”;③不等式
解集为
;
其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0bdfea687d58da88b42064628fbc2ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d76ee2e81f447f84a3e0b39c0388ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10805fbb6b50f351305edfa18c7fcfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0563035d307e1e12c2ad967fd20fff11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa46657e1ce3a4c50a391db666ae2dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f7dcc0832fc9f886956915ffd9447f3.png)
其中正确结论的个数是( )
A.1个 | B.2个 | C.3个 | D.0个 |
您最近一年使用:0次
2021高三·全国·专题练习
10 . 下列命题中的真命题是( )
①“若
,则
、
不全为零”的否命题;
②“正多边形都相似”的逆命题;
③“若
,则
有实根”的逆否命题;
④“若
,则
是无理数”的逆否命题.
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0527f3801a1f5fae326d9411555b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
②“正多边形都相似”的逆命题;
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d7d3e4135f9307eaea21f8665fb893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.①②③④ | B.①③④ |
C.②③④ | D.①④ |
您最近一年使用:0次