已知
.
(1)若
成立,求实数
的取值范围,
(2)若
和
中至多有一个成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0554cdd0dbff111955cb3ec226582b01.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2023-10-13 11:06:24
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【推荐1】已知
,命题p:对
,不等式
恒成立;命题q:对
,不等式
恒成立.
若命题p为真命题,求实数m的取值范围;
若
为假,
为真,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f80265eeb5eb4e8a3e4ca96f29953b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5af1542723d9e783bd43c7030b24cb.png)
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【推荐2】设
,命题
;命题
.
(1)若
为真命题,求
的最大值;
(2)若
一真一假,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e72f6b2ef3329828cb8fc873eeba7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c523398e9cfad93674b07bd0e97a1a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/197625aa35399fd89271a97ae1c149cf.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
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【推荐1】设
,命题p:
,命题q:
.
(1)若命题p是真命题,求
的取值范围;
(2)若命题¬p与q至少有一个为假命题,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5c50c2338ca344091b54d64211a537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/961d12837555e1547d23200478bb42ea.png)
(1)若命题p是真命题,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若命题¬p与q至少有一个为假命题,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知命题p:∃x∈R,x2+(a+1)x+4<0;命题q:∀x∈[1,e],ln x-a≤0.若p为假命题,求实数a的取值范围;
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适中
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解题方法
【推荐1】命题
:“
,
”,命题
:“
,
”.
(1)写出命题
的否定命题
,并求当命题
为真时,实数
的取值范围;
(2)若
和
中有且只有一个是真命题,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87008291cdba83461d58dbc9426d777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434e4d10d04a5beebd7a7ace0f2681cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccd7af9298cd5ff19d8866fedb42ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224e3dd9be0bea6931ce93c1e0cd5ab0.png)
(1)写出命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】在数学中,有很多“若p,则q”形式的命题,有的是真命题,有的是假命题.例如:若
,则
;(假命题).这个命题是省略了量词的全称量词命题.
(1)“若
,则
.”用含量词的符号表示为:
,
.请你写出这个命题的否定;
(2)求
的取值范围,使“若
,则
”是真命题.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40ea6f3f9d6a30db97b1935dbb6bafe.png)
(1)“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40ea6f3f9d6a30db97b1935dbb6bafe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fad1dd76d5b72f10f5bb62693a2996f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40ea6f3f9d6a30db97b1935dbb6bafe.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2ac0b9d3cbb377704004afa3ba19f7.png)
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【推荐1】已知
.
(1)若不等式
的解集为
,求不等式
的解集;
(2)若
,且对任意的
,都存在
,使得
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e059b0d6094e5f345566fce8b7bb22.png)
(1)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc9ede2e55724383dd1093fc7fcdb59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c33b69adc112831fa115b5dffdb616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d5dc98a05e2253f80b526f0c12b82d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0de341c03111d7f4e10de2e854a5ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e07afb2bf68f160cdd18ea64094fc92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc657c0b715e190f59ad61d765c86f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25de114912ee3e222cb571078db03eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知函数
.
(1)若
,
,不等式
对一切实数x都成立,求a的取值范围;
(2)若
的解集为
,求关于x的不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d7ed6f4b0e08cd887d2fdc2a5e37e4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d00e896ece0bec6845cdf25235bcbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e768f6d07a30c490a1011a8256548bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f48e1c656aace41360467f254e359d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72656c882b2830eeb8053ec18c0088f.png)
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