名校
1 . 命题“若
,则
”的否命题是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af3a1e3599964c9d6ca650d500d9d78.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
您最近一年使用:0次
2019-09-26更新
|
391次组卷
|
2卷引用:重庆市南开中学2020届高三上学期第一次教学质量检测考试数学(文)试题
2 . 下列命题中正确命题的个数是
①“若
,则
”的逆否命题为“若
,则
”;
②“
”是“
”的必要不充分条件;
③若“
”为假命题,则
,
均为假命题;
④若命题
:
,
,则
:
,
.
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a678cd018f89c3518645bc8439805ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be670d32e753012125c503f2f3be56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d87d0880cedf1b1becc6bcb3a7c3db.png)
②“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3e3f3a5ee26b44931b0b1a5b4723e3.png)
③若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
④若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2939abf9f1755ea304eeb1e73063cba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8324cd30a90a7fa5c80543eb7456ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264dab145ceba44696a6ee63b1e1549d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019高三·全国·专题练习
3 . 命题“若a,b,c成等比数列,则b2=ac”的逆否命题是( )
A.“若a,b,c成等比数列,则b2≠ac” |
B.“若a,b,c不成等比数列,则b2≠ac” |
C.“若b2=ac,则a,b,c成等比数列” |
D.“若b2≠ac,则a,b,c不成等比数列” |
您最近一年使用:0次
名校
4 . 以下四个命题中,真命题的个数是
①“若
,则
中至少有一个不小于1”的逆命题;
② 存在正实数
,使得
;
③
;
④ 函数
是奇函数,则
的图像关于
对称.
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1a2cbcc1fb41a01668f1808267df4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
② 存在正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a111fd49fdfaf2e32d78732719a0851b.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b712566835342779cd6ee78da5d9c7.png)
④ 函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b727eb9da56be079445321cf61cf26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
5 . 命题“若
,则
或
”的逆否命题是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0674386f0d1fcf53da104626f2da95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7b54325f484648850d3e9f8cb3209d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7b54325f484648850d3e9f8cb3209d.png)
您最近一年使用:0次
名校
6 . 以下说法中正确的是__________ .
①函数
在区间
上单调递减;
②函数
的图象过定点
;
③若
是函数
的零点,且
,则
;
④方程
的解是
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ede389b43c78417912542746d91d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8bd00a1b1c012681aab8513b755cbc.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7195a989aadb54ec805943fe7a63129f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c7b74fd862d7e3f35e40ae1f626c4c.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73403cb5cd801ad9ef51453b4d37c503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dee1c251ad64fa19960d5a5b6c03ddb.png)
④方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64dfd88631bc4e4c5ae4b5dbf720840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094a10ebd3f407473cbf9d076d1f80d0.png)
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2019-07-11更新
|
1640次组卷
|
3卷引用:河北省隆华存瑞中学(存瑞部)2018-2019学年高一上学期第二次数学试题
7 . 已知实数
,
,
,则下列命题正确的是
![](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/e81e59019989b7dc2fb59b037ef6e010.png)
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
您最近一年使用:0次
8 . 下列结论中不正确的个数是
①“
”是“
”的充分不必要条件;
②命题“
”的否定是“
”;
③线性回归直线不一定过样本中心点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6570492ffb2968a8ee7d0c5596e533.png)
④“若
,则
”的逆否命题是假命题
①“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f56a20bc5fce6b02217627b42249854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7bb6db7a3e849d27a355e6f10d7827.png)
②命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2753007104b871f633afea4b6d16b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ded49da6ee2529fe45feedd1fddf59.png)
③线性回归直线不一定过样本中心点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6570492ffb2968a8ee7d0c5596e533.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b05d2be27e8f53e4de3071846dffb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ad78dc8b8aed907b4fe9640c997454.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
9 . 命题“若
,则
或
”的逆否命题为__________ .
![](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/707ea658f3a9359f5740d5aab48f7948.png)
您最近一年使用:0次
2019-05-19更新
|
766次组卷
|
3卷引用:山西省永济中学2018-2019学年高二上学期期末考试数学(文)试题
10 . 设命题
:
,命题
:
,则下列命题中为真命题的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45392af14e5795c9e28ff65fba641026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d45aef0042d5aeed211f85506477141.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2019-05-19更新
|
481次组卷
|
3卷引用:山西省永济中学2018-2019学年高二上学期期末考试数学(文)试题