已知函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
是偶函数,求实数a的值;
(2)设函数
,若关于x的方程
有且只有一个实数根,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0dd204feee3f419abb932ca7422e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80df56f8111e247f37c95b2c7c88ab29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9587df831df1af5e7dd6be5fdc7bd8ce.png)
更新时间:2022-07-13 09:14:47
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解答题-问答题
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名校
【推荐1】定义:函数
为“下取整函数”,其中
表示不大于
的最大整数;函数
为“上取整函数”,其中
表示不小于
的最小整数;例如根据定义可得:
,
,
,
.
(1)函数
,
;求
和
;
(2)判断(1)中函数
的奇偶性;
(3)试用分段函数的形式表示函数:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7179c645736d68c90023f83d7f11ed01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1faee507ac27d049d17add3a76a97751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2efc4b458ea20c1acca4317505e9fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0582aa1aa68e686d214659b220d2f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933ad926785d6302eb8a4eaac35c46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78104e5847f3acc273a6a15f6b0f2177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50b5eca0ca13cec9614c1d9ac6a68b2.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419ef811c64d2f497c3ce1a4c99606a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24aa16b780156e18f12baa2b8ee0f9a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d33ae476ed239438c77625a1cd4b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8d2ec68ea39231fe28988fdb017438.png)
(2)判断(1)中函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)试用分段函数的形式表示函数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec05a45fecaf7bdaf614a20f781f74a.png)
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【推荐2】已知函数
为实常数).
(1)判断
的奇偶性,并给出证明;
(2)若
,设
在
上的最小值为
,求
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5123a53671d5d459f69798e2c7493bfc.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9210e75c35fb455d0446eb7ddba7d79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a7b7c834d06f3e28a339db94690172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a7b7c834d06f3e28a339db94690172.png)
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【推荐3】设函数
的定义域为R,并且满足
,且
当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83a3a0c5ab31b32f2d8db02dce3e77b.png)
(1)求
的值;
(2)判断函数
的单调性,并给出证明;
(3)如果
,求
的取值范围;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb65d839d62c7bc7d8fd0e5890e93f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ad20069dd18e32d5888fc9dfaa373e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83a3a0c5ab31b32f2d8db02dce3e77b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365f5ac9c0d75ff80bd10f9924cfdd80.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462b710a5eec6d9461e693dab752bee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】已知m∈R,对p:x1和x2是方程x2-ax-2=0的两个根,不等式|m-5|≤|x1-x2|对任意实数a∈[1,2]恒成立;q:函数f(x)=3x2+2mx+m+
有两个不同的零点.求使“p且q”为真命题的实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
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【推荐2】已知
且
,函数
在
上是单调递减函数,且满足下列三个条件中的两个:①函数
为奇函数;②
;③
.
(1)从中选择的两个条件的序号为______,依所选择的条件求得
______,
______.
(2)在(1)的情况下,关于
的方程
在
上有两个不等实根,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fddb1b1e4b0b8eb17095e644ff0c1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26adb8926e85d93d87e254077e251d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17d5250c5d7f56bc5750bbb1c1182d9.png)
(1)从中选择的两个条件的序号为______,依所选择的条件求得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)在(1)的情况下,关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7787174355e5d2a3d124ec23767453a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1591d4244dcf5539a4ae98f554e91e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】已知函数
.
(1)求函数
的定义域,判断函数
的奇偶性,并说明理由;
(2)关于x的方程
有两个不同的实数解,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a4b66d692065b02af1eae4593a0f464.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e468ab2281927213bfd83aba0826d7.png)
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【推荐1】为了保护环境,发展低碳经济,某单位在国家科研部门的支持下进行技术攻关,新上了把二氧化碳处理转化为一种可利用的化工产品的项目.经测算,该项目月处理成本y(元)与月处理量x(吨)之间的函数关系可近似地表示为
且每处理一吨二氧化碳得到可利用的化工产品价值为200元,若该项目不获利,国家将给予补偿.
(1)当
时,判断该项目能否获利.如果获利,求出最大利润;如果不获利,则国家每月至少需要补贴多少元才能使该项目不亏损;
(2)该项目每月处理量为多少吨时,每吨的平均处理成本最低.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0df7d45075040a2d8eebe02b13c0617b.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ae6a57d4d06d63051358808d411ce9.png)
(2)该项目每月处理量为多少吨时,每吨的平均处理成本最低.
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【推荐2】已知直线
:
,圆
:
.
(1)判断直线
与圆的位置关系,并证明你的结论;
(2)直线
过直线
的定点且
,若
与圆
交与
两点,
与圆
交与
两点,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfc025cd9862619119d0e17aa9bcdc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6945a4efccb2f202b29e628caf887154.png)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfac06e719312bc1bce84992704c1bca.png)
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【推荐3】近日,随着新冠肺炎疫情在多地零星散发,一些城市陆续发出“春节期间非必要不返乡,就地过年”的倡议.为最大程度减少人员流动,减少疫情发生的可能性,某地政府积极制定政策,决定政企联动,鼓励企业在春节期间留住员工在本市过年并加班追产.为此,该地政府决定为当地某
企业春节期间加班追产提供
(万元)的专项补贴
企业在收到政府
(万元)补贴后,当补贴小等于5万元时,产量
将维持在6万件不变,当补贴超过5万元时,产量将增加到
(万件).同时
企业生产
(万件)产品需要投入成本为
(万元),并以每件
元的价格将其生产的产品全部售出.(注:收益=销售金额+政府专项补贴-成本)
(1)求
企业春节期间加班追产所获收益
(万元)关于政府补贴
(万元)的函数关系式;
(2)当政府的专项补贴为多少万元时,
企业春节期间加班追产所获收益最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71922d1bedcb574477a99fa939e8f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba17941335b3dbff51949e297514ed53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cee8758a68409c8da135e3cb5d55970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c0113f27b62d5c9fad2f1e3343de01.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966dfe9109671c587892bd32f0b6699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当政府的专项补贴为多少万元时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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