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)
2022高一·全国·专题练习 查看更多[1]
(已下线)专题1.9 全称量词与存在量词-重难点题型精讲
更新时间:2022-07-22 20:30:22
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【推荐1】指出下列命题是全称命题还是特称命题,并判断它们的真假.
(1)
,
是奇数;
(2)
,使
;
(3)能被
整除的整数末位数是
;
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ced8a20b0ac50c7b37ce2b2c24d9db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ac7fa45d1a150d095f7ae45aab0696.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85552284b2c87ceb6903ccf8413da275.png)
(3)能被
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
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【推荐2】已知
,命题
.
(1)判断
是全称量词命题,还是存在量词命题;
(2)若
均为真命题,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3276b5e12396fc4753eb3f8254f9fa68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3444d49c2de8c01c3995e84e90ec6d2.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】判断下列命题是全称量词命题还是存在量词命题,并判断其真假.
(1)至少有一个整数,既能被11整除,又能被9整除;
(2)
,
;
(3)
,使
为29的约数;
(4)
,
.
(1)至少有一个整数,既能被11整除,又能被9整除;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad5fe274cfc8da2dacfb65801f344ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54b46a35e46c889db628e0b8f2495b1.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e8d75ddacfcf2ca1af48e959397fad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb79b17f81e3bdd2fa3af9b4be28c9c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c461d76fce244455f2a06b866f8ba500.png)
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【推荐2】判断下列命题是全称命题还是存在性命题,并判断其真假:
(1)对任意
,
;
(2)对任意非零实数
,若
,则
;
(3)
,使得
;
(4)
,使得
.
(1)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a747d8d921a8213ba1fcf8177ab6abd.png)
(2)对任意非零实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa75a1b4bf19475c8ef1c8617b6fef0.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1afd9723205198e18ef45c9c35b9b583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514aaed013a8b1abf0d505ce246e0e5c.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8645952ea14b25443f411d39bdec641e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92c4303ebef88f0862f8d625cd5356b.png)
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解题方法
【推荐1】已知命题
:
,
,且
为假命题时,
的取值集合为
.
(1)求
;
(2)请写出一个非空集合
,使得“
”是“
”的必要不充分条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8645952ea14b25443f411d39bdec641e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e1a6ed3b9acb8e283e5a5de764d328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)请写出一个非空集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af958d6c104355d6daf0d205204ec760.png)
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【推荐2】写出下列命题p的否定,并判断其真假.
(1)p:
,
.
(2)p:不论m取何实数,方程
必有实数根.
(3)p:有的三角形的三条边相等.
(4)p:等腰梯形的对角线垂直.
(1)p:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccd7af9298cd5ff19d8866fedb42ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
(2)p:不论m取何实数,方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ceb28e28abf945f7c5d480222817f97.png)
(3)p:有的三角形的三条边相等.
(4)p:等腰梯形的对角线垂直.
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【推荐1】写出下列命题的否定.
(1)有些实数的绝对值是正数;
(2)某些三角形是正三角形;
(3)
,使得
.
(1)有些实数的绝对值是正数;
(2)某些三角形是正三角形;
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccd7af9298cd5ff19d8866fedb42ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/072c300a8d75385dbe53caeb2514fa00.png)
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【推荐2】写出下列命题的否定并判断其真假.
(1)所有正方形都是矩形;
(2)至少有一个实数x0使x3+1=0;
(3)存在θ∈R,函数y=sin(2x+θ)为偶函数;
(4)任意x,y∈R,|x+1|+|y-1|≥0.
(1)所有正方形都是矩形;
(2)至少有一个实数x0使x3+1=0;
(3)存在θ∈R,函数y=sin(2x+θ)为偶函数;
(4)任意x,y∈R,|x+1|+|y-1|≥0.
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