1 . 给出下列四个命题:
①“若
,则
”的逆命题;
②“若数列
是等比数列,则
”的否命题;
③“若
,则关于
的方程
有实根”的逆命题;
④“若
,则
”的逆否命题.
其中假命题是___________ .
①“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce5ac0e36502919c76bccf50b1c8735b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45f68247f245829af04a4aa58820d57e.png)
②“若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be02544e0fb9b80e2ce723bcc697da93.png)
③“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56485f5459cbead897ee5f874f249c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e232f45482195a9500e067fe9f970af0.png)
④“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ceb1f338fa60976229d7ec6531b626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf22d7d1a965bda25168a233fb6290c.png)
其中假命题是
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2 . (1)判断四种命题的真假
(2)用充分条件和必要条件填空.
①A⊆B,则p是q的_________ ;
②若_________ ,则p是q的充分不必要条件;
③若B⊆A,则p是q的_________ ;
④若_________ ,则p是q的必要不充分条件;
⑤若A⊆B且B⊆A,即A=B,则p是q的_________ .
原命题 | 逆命题 | 否命题 | 逆否命题 |
真 | 真 | ||
真 | 假 | ||
假 | 真 | ||
假 | 假 |
①A⊆B,则p是q的
②若
③若B⊆A,则p是q的
④若
⑤若A⊆B且B⊆A,即A=B,则p是q的
您最近一年使用:0次
3 . 已知方程
.
(
)若已知方程表示椭圆,则
的取值范围为__________ .
(
)语句“
”是语句“方程
”表示双曲线的( ) .
A.充分不必要条件 B.必要不充分条件 C.充在条件 D.既不充分也不必要条件
(
)根据(
)的结论,以“如果
那么
”的形式写出一个正确命题,记作命题
,则
命题
:__________ .
(
)套用量词命题的格式:“
,
”或“
,
”,改写(
)中命题
,
表述形式为:__________ .
(
)写出(
)中命题
的逆命题,记作命题
,则
命题
:__________ .
(
)判断(
)中命题
的真假 ,并陈述判断理由.
命题为__________ 命题,因为__________ .
(
)若已知方程表示椭圆,则该椭圆两个焦点的坐标分别为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446769af94baa1d259d07cdeb7aca5f4.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ae2bf581efc8d27920d25ae83cb080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446769af94baa1d259d07cdeb7aca5f4.png)
A.充分不必要条件 B.必要不充分条件 C.充在条件 D.既不充分也不必要条件
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084b1a8d3e1e48584439316cda30bcc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b628e370665f775324a9801b63d1d248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df11ed964364160064b6badaca2f7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b628e370665f775324a9801b63d1d248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
表述形式为:
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
您最近一年使用:0次
4 . 命题“若
,则
”以及它的逆命题、否命题中,真命题的个数为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2584d4e78881413d8ddd1ec84011db2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2559752ee6654280033abce67259c37c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次