名校
1 . 写出下列命题p的否定,判断真假并说明理由.
(1)
,
;
(2)p:不论m取何实数,关于x的方程
必有实数根;
(3)p:有的平行四边形的对角线相等;
(4)p:等腰梯形的对角线互相平分.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248d3fb187b56abeb0317dee8ae6a010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a11c538a2fdc64c1f118d3d0d7261b.png)
(2)p:不论m取何实数,关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f5afb8db2951e302633ff604ca6f39.png)
(3)p:有的平行四边形的对角线相等;
(4)p:等腰梯形的对角线互相平分.
您最近一年使用:0次
2022-09-14更新
|
476次组卷
|
2卷引用:河南省叶县高级中学2022-2023学年高一上学期9月月考数学试题
2 . 写出下列命题的否定.
(1)有些四边形的四个顶点在同一个圆上;
(2)
,
;
(3)所有能被3整除的数都是奇数;
(4)
,
;
(5)不论
取何实数,方程
必有实数根.
(1)有些四边形的四个顶点在同一个圆上;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555199660bd13938101f5ffb19138066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40ea31cfaffab639b1477524de19b79.png)
(3)所有能被3整除的数都是奇数;
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ff4aef3086376491e2a54a868a58dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd13e8b5914af55dad0f3946527a46bf.png)
(5)不论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
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2022-08-08更新
|
386次组卷
|
3卷引用:北师大版(2019) 必修第一册 名校名师卷 第二单元 常用逻辑用语
2022高一·全国·专题练习
3 . 判断下列命题是全称命题还是特称命题,写出这些命题的否定,并说出这些否定的真假,不必证明.
(1)存在实数x,使得
;
(2)有些三角形是等边三角形;
(3)方程
的每一个根都不是奇数.
(1)存在实数x,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5f73f7c22d696e8a6777b35f57352a.png)
(2)有些三角形是等边三角形;
(3)方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9ced589b1b3ee9ec41d81e35f33055.png)
您最近一年使用:0次
2022-07-22更新
|
543次组卷
|
3卷引用:专题1.9 全称量词与存在量词-重难点题型精讲
2022高一·全国·专题练习
4 . 判断下列命题是全称量词命题还是存在量词命题,请写出它们的否定,并判断其真假:
(1)p:对任意的x∈R,
都成立;
(2)q:∃x∈R,使
.
(1)p:对任意的x∈R,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba775e0260ffbe30df0600b8dc5cf5fb.png)
(2)q:∃x∈R,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a583518fc946bb6c3fd01fbe0484622c.png)
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名校
5 . 写出下列命题的否定,并判断它们的真假:
(1)
:任意两个等边三角形都是相似的;
(2)
:
,
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02491f9709f00a1bc169278fbe01f576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f0cb644cb734f63c889fa1c5d7252e.png)
您最近一年使用:0次
21-22高一·湖南·课后作业
6 . 写出下列命题的否定.
(1)所有的无理数都是实数;
(2)
,
;
(3)平行四边形的对边相等;
(4)
,
.
(1)所有的无理数都是实数;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ad23dae9c388a54006d030ae4c9588.png)
(3)平行四边形的对边相等;
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ef6ac3a5f1358143e94eb31f6687d2.png)
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21-22高一·湖南·课后作业
7 . 对下列含有量词的命题作否定,并判断其真假.
(1)
:
,
;
(2)
:所有能被2整除的数都是偶数;
(3)
:存在
,使得
;
(4)
:
,
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4291d9e7ae21633c02d83dd804dfac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5306300d3626da0edd4d92250bb08085.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070054c0b4182ab7399ed56925844e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df62f80ddca67284233c37c026e4c820.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac061e46cee6c6dd4701840f847fb8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6cb36e866e472073d950c221d138230.png)
您最近一年使用:0次
21-22高一·湖南·课后作业
8 . 对下列含有量词的命题作否定,并判断其真假.
(1)存在某个整数
,使得
;
(2)任意实数都可以写成平方和的形式;
(3)每个能被写成两个奇数之和的整数都是偶数;
(4)
,方程
有实数根;
(5)
,方程
有实数根.
(1)存在某个整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00ff8ec1133d7bd81fbc2d963d415de.png)
(2)任意实数都可以写成平方和的形式;
(3)每个能被写成两个奇数之和的整数都是偶数;
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7291c3444d436ee17295ce6b829c72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac671e6d87de2fb5f7ad3aab582866d.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756cd04fb04459ef15b1d37c9bb88e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437bceb596deddba816acf6e44e2d2ee.png)
您最近一年使用:0次
21-22高一·湖南·课后作业
9 . 对下列含有量词的命题作否定,并判断其真假:
(1)
,
;
(2)
,
;
(3)
,
;
(4)
,
;
(5)任意三角形都有内切圆;
(6)任意两个直角三角形都是相似三角形.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40dc0edad8fc6bc6b1fa560bbb16c7fa.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b0c2f97358499bb0c6801e4d97d9f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbf50b34d559607dc5a75c90a72e558.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccd7af9298cd5ff19d8866fedb42ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d953c3939039f466521209832091677.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbca941d8e2c4ce541371255403ca111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4302b54cd484528a54cab74b792750a.png)
(5)任意三角形都有内切圆;
(6)任意两个直角三角形都是相似三角形.
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名校
解题方法
10 . 设命题p:方程
表示焦点在坐标轴上的双曲线,命题
.若“
或
”为真命题,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcfbc3c45ecd849cba4764d9071cda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79c6c190c4fab7b813c09834210e825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30cc102a3d288a1e0158e537b1ce5ad8.png)
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