(1)已知命题
,
.若命题
是假命题,求
的取值范围;
(2)若命题
的否定是命题
的否定的必要不充分条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bd27481b400472b2e47d48d3337168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624111b92a9f58cdefac9080147ee500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若命题
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2023-04-21 16:05:46
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【推荐1】设
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:
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【推荐2】已知集合
,集合
,集合
.
(1)求
;
(2)若
,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6dc4280158f7b675454e4808f87f3bc.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6ca098b764e0366d043b69ae9d8f68.png)
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解题方法
【推荐1】已知
:
.
(1)若
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(2)已知
:
,如果
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ff04c4dbac50829387114e1c3dde3d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6fcfdcd0fcf0cb1fb3df6d36cc91b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
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【推荐2】设命题![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
,
;命题![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
,使
.
若命题
为真命题,求实数
的取值范围;
若命题
,
一真一假,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb0b3ed2ce0634b4b98c5ad79452b36.png)
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【推荐1】 已知命题p:x∈A={x|a-1<x<a+1,x∈R},命题
q:x∈B={x|x2-4x+3≥0}.
(1)或A∩B=∅,A∪B=R,求实数a
(2)若
是p的必要条件,求实数a.
q:x∈B={x|x2-4x+3≥0}.
(1)或A∩B=∅,A∪B=R,求实数a
(2)若
![](https://img.xkw.com/dksih/QBM/2012/8/21/1570973788192768/1570973793615872/STEM/cadccfd19b3740f1a991fe3ee372b67d.png?resizew=25)
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【推荐2】已知全集
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/39544e82-efb8-4910-bcad-29a766a15d48.png?resizew=155)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aed39f5aca78934fb383402433fe549.png)
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【推荐1】关于x的不等式
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【推荐2】已知命题:“
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的取值集合
;
(2)设不等式
的解集为
,若
是
的充分条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd474084de48472cd61eee4a34cf2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f3011c41b8f128ccb829a9ad13d676.png)
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(2)设不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd18e3c3dbddfecb50bfd8124103d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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