(1)若
,是不等式
成立的必要不充分条件,求实数的
取值范围;
(2)已知集合
,
.若“
”是“
”的充分条件,求实数
的取值范围;
(3)已知命题“
,
”的否定为假命题,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cef4e0299f56a45027e55ef53f66c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)已知集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca02344c2c76ccf07f5284bed9c7d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d0da05045de222c358da75044e9aef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066d9ee98912071f2231f732fcf9405d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2020-03-24 15:34:33
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】已知不等式
的解集为
.
(1)求不等式
的解集
;
(2)设非空集合
,若
是
的充分不必要条件,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8023e1902803a7939d2aa32ba9e2d44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1843f4648d7cd79a1573abea5c9470fa.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1c8f0836b1e3ba81f5371855a6365f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(2)设非空集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff05221830dcbb8141bceb8ded58e43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8647b00cc8c8f35555c7d78cf2812c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd044d22a32a7014b70d5fee694051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知:集合![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd28801240ae85e4a390204cb18ca9c5.png)
(1)若
是
的充分条件,求实数
的取值范围;
(2)若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd28801240ae85e4a390204cb18ca9c5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-问答题
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【推荐1】在①充分不必要;②必要不充分;③充要这三个条件中任选一个,补充到下面的横线中,求解下列问题:
已知集合
,
.
(1)若
,求
;
(2)是否存在实数a,使得
是
的 条件.若存在,求实数a的取值范围;若不存在,
请说明理由.
(注:如果选择多个条件分别解答按第一个解答计分)
已知集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a283d08633fb0ef2eb7f5d29daf767f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e666843790b0d045d39eb39231c0897.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
(2)是否存在实数a,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
请说明理由.
(注:如果选择多个条件分别解答按第一个解答计分)
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【推荐2】已知集合
,
.
(1)命题p:
,命题q:
,若p是q的必要不充分条件,求实数m的取值范围.
(2)命题“r:
,使得
”是真命题,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fbb97a6d54ff795e00f1020da84539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ebaf484d8eca7b6445a31a988cf70d.png)
(1)命题p:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
(2)命题“r:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a375fae50ad1b3d14c011673110256fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
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【推荐1】已知命题p:方程x2+mx+1=0有两个不相等的实根;q:不等式4x2+4(m–2)x+1>0的解集为R.
(1)若命题q为真,求实数m的取值范围.
(2)若命题“p且q”和“非p”为假,求实数m的取值范围
(1)若命题q为真,求实数m的取值范围.
(2)若命题“p且q”和“非p”为假,求实数m的取值范围
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【推荐2】已知命题
:不等式
对任意实数
恒成立;命题
:存在实数
满足
;命题
:不等式
有解.(1)若
为真命题,求
的取值范围.(2)若命题
、
恰有两个是真命题,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b940c4c97f65502fca27214b54c8625.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc481ffce7a83f0759ac58dbcf42a642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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