已知集合
,集合
.求
和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e291e4d2d50dc054fccee4d1209698d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a067332cda1825ed33b7c1f88b0e2f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81919684bc4047d376c7e57dc6c8f1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ae18508906c21d3e1199f231b1a9a4.png)
更新时间:2018-01-08 08:35:39
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【推荐1】已知不等式
的解集为A,不等式
的解集为B.
(1)求A∩B;
(2)若不等式
的解集为A∩B,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e1bcced697608aa2a6c6afcc181da7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f90af9ba1a3d2362ecba6775e1d0030.png)
(1)求A∩B;
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8023e1902803a7939d2aa32ba9e2d44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
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【推荐2】已知集合
,
,
.
(Ⅰ)若
,求集合
;
(Ⅱ)在
,
两个集合中任选一个,补充在下面问题中,命题
:
,命题
:
________,求使
是
的必要非充分条件的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1366d4bf9f9196e3518055809b9751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880e22fd64cbfd9b1f4640fdaa768760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72296f2b1bb660c6c4d0ab6075800d0f.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
(Ⅱ)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44c45ef0334070fc149b452dee26ae5.png)
![](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)
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【推荐1】设全集
,集合
,集合
.
(1)当
时,求
,
;
(2)若命题
,命题
,命题p是命题q的充分不必要条件,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860ebb6f76cd3cb9a265dfc233002a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/badbd47f3ae45a35e3da7b7a49b8542e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0670c24020dfa63f856cfd3e66d8cd27.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db265773aaa855915ed0b8d3f66a70a.png)
(2)若命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc11e9183ffccd297df4a1c18618bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218c5309e534904dc6bf768074965239.png)
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【推荐2】已知集合
,
,
.
(1)求
,
:
(2)若
,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1099c2b5db86f6b4d3a8c189a4d400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2299a728e865b82a1a9724efc3030031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fbebad34a682c9bb520f1791cb7bdb5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89504e77251a53877e41b64cb5c943d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e968937d457d9e2237b401077ff224a.png)
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【推荐1】已知不等式
.
(1)当
时解此不等式;
(2)若对于任意的实数
,此不等式恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d467c2634ba4c261764aa1fa0758e6e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
(2)若对于任意的实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知集合______,集合
.从下列三个条件中任选一个,补充在上面横线中.①
;②
;③
.
(1)当
时,求
;
(2)若
,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496f4d66b6d9492367f86a9d33083729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7654d7fca37e484fad355ad74e6eca30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00a0c5dcd17287d736d4218ed5098ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e31163e0d58c9a0f2b300449478ff197.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aed39f5aca78934fb383402433fe549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e26031c3503a7feaed656c48614fc52.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbbe46a98a8fdebfc46fcbc45dc88e8.png)
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【推荐3】去年以来新冠肆虐,我国在党中央的领导下迅速控制住新冠疫情,但完全消除新冠的威胁仍需要长期的努力.某医疗企业为了配合国家的防疫战略,决定投入
万元再上一套生产设备,预计使用该设备后前
年的支出成本为
万元,每年的销售收入
万元.
(1)估计该设备从第几年开始实现总盈利;
(2)使用若干年后对该设备处理的方案有两种:
方案一:当总盈利额达到最大值时,该设备以
万元的价格处理;
方案二:当年平均盈利额达到最大值时,该设备以
万元的价格处理;
问哪种方案较为合理?并说明理由.(注:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f189b13b1c56edf9b3c57431763f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468181ed4a063e65e226f048a7505e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128de649220637bdc96fc3e508592201.png)
(1)估计该设备从第几年开始实现总盈利;
(2)使用若干年后对该设备处理的方案有两种:
方案一:当总盈利额达到最大值时,该设备以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
方案二:当年平均盈利额达到最大值时,该设备以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
问哪种方案较为合理?并说明理由.(注:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee625bd049ed4a67ea6a9781967c8f5a.png)
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