题型:单选题
难度:0.94
引用次数:245
题号:12696689
若
是真命题,
是假命题,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2021-04-08 18:07:05
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容易
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名校
【推荐1】下列有关命题的说法中错误的是( )
A.若p∧q为假命题,则p,q均为假命题 |
B.命题“若x2-3x+2=0,则x=1“的逆否命题为:“若x≠1则x2-3x+2≠0” |
C.若命题p:∃x∈R,使得x2+x+1<0,则¬p:∀x∈R均有x2+x+1≥0 |
D.“x=1”是“x2-3x+2=0”的充分不必要条件 |
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【推荐2】下列有关命题的说法正确的有( )
(1)若p∧q为假命题,则p、q均为假命题;
(2)“x=1”是“x2﹣3x+2=0”的充分不必要条件;
(3)若“p∨q”为假命题,则“¬p∧¬q”为真命题.
(4)命题“若x2﹣3x+2=0,则x=1”的逆否命题为:“若x≠1,则x2﹣3x+2≠0”
(1)若p∧q为假命题,则p、q均为假命题;
(2)“x=1”是“x2﹣3x+2=0”的充分不必要条件;
(3)若“p∨q”为假命题,则“¬p∧¬q”为真命题.
(4)命题“若x2﹣3x+2=0,则x=1”的逆否命题为:“若x≠1,则x2﹣3x+2≠0”
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】已知命题
,
,
,
,则下列命题是真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b850162f49aed5582ca13fc80e71bb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f4aff3a68ae5c306dd8ae2c2c7f982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4299158728dc0c92ab55c0d15faf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f160d875700c3e047273fa7dd8b09d66.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】已知命题
:
是“直线
和直线
互相垂直”的充要条件;命题
:对任意
都有零点;则下列命题为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f24a95abaec12df2d5289f49faa40adb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca529f4c3c93db2bb1728466d616c5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aca3272c91ba9773f1c8342cdfdc432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9484166423b5e51390bf00e3bbe5446e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】已知命题
,
;命题
若
,则
.下列命题为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bea9702708f8463975c94119fa50f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814cf6a1c32bf49ca31852fba644203c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f7c54faca6eac8af5309942062058d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】已知p:
,
有解,q:
,
,则下列选项中是假命题的为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60fd2e3d2a0e31302e84c348d903a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d6c9d20a5b1abf77d4d70d5ac9ba77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffa21facc7cc70f9b656465469b8ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0994d30bfafbd5b23d6b636e4be2e100.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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