解题方法
1 . 集合
,且
,则实数
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20d6c93cab89575137f84ed402f475f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a2410ce34b36954ed4923e600d42f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2 . 定义域是一切实数的函数
,其图象是连续不断的,且存在常数
(
)使得
对任意实数
都成立,则称
是一个“
-伴随函数”,有下列关于“
-伴随函数”的结论:①
是常数函数唯一一个“
-伴随函数”;②“
-伴随函数”至少有一个零点;③
是一个“
-伴随函数”;其中正确结论的个数( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd9736828195f010db4e1f0a9dea7a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a8c0e8a20de97737d75b93136da3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3047d4ab078dafc06c047bcbf0a6ffaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318a16f1950d06e5500c76d8f81a507f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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3 . 某地区上年度电价为0.8元
,年用电量为
,本年度计划将电价降到0.55 元
至0.75元
之间,而用户期待电价为0.4元
,下调电价后新增加的用电量与实际电价和用户期望电价的差成反比(比例系数为K),该地区的电力成本为0.3元
.(注:收益=实际用电量
(实际电价-成本价)),示例:若实际电价为0.6元
,则下调电价后新增加的用电量为
元
)
(1)写出本年度电价下调后,电力部门的收益
与实际电价
的函数关系;
(2)设
,当电价最低为多少仍可保证电力部门的收益比上一年至少增长
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea51143ea31be9878b1f7f742bea6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9bd90468ef17444d9a02ad65a4a5696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea51143ea31be9878b1f7f742bea6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea51143ea31be9878b1f7f742bea6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea51143ea31be9878b1f7f742bea6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea51143ea31be9878b1f7f742bea6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea51143ea31be9878b1f7f742bea6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f6841a1f0d08c7b3d7da8d8b8d4a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea51143ea31be9878b1f7f742bea6e7.png)
(1)写出本年度电价下调后,电力部门的收益
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f0d3851b85cef50e53fd6d02eea086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23466fd31d0666cb9f65dced41188359.png)
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4 . 已知
,集合
,记
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc48c9553f14cc4e357c3d309df83ae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761ea6433b07815752cd9dc06dc1c55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6504c7d37a0a5d099e6c4b865c7775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87adc5db76cf8c1721d7e0a29b748688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc48c9553f14cc4e357c3d309df83ae3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-03-06更新
|
108次组卷
|
2卷引用:上海市七宝中学2016-2017学年高一上学期期中数学试题
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5 . 如图,
是全集,
是
的子集,则阴影部分表示的集合是_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/2cf46fcf-5d8f-4121-b822-1242c9c966de.png?resizew=144)
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6 . 若集合
,则以下集合中一定是空集的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2333f966f6ec29f0661f93d99b055cd5.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-03-04更新
|
252次组卷
|
2卷引用:上海市莘庄中学2016-2017学年高一上学期期中数学试题
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7 . 给出下列四个命题:
①两根均为实数的一元二次方程一定是实系数方程;
②已知曲线
:
和两定点
、
,若
是
上的动点,则
;
③设
是定义在
上的函数,且对任意的
,
恒成立,则
是
上的奇函数或偶函数;
④设
、
均是定义在
上的函数并都有最小值,且对任意的
,命题“
或
”正确,则
最小值为正数或
最小值为正数.
上述命题中错误的个数是
①两根均为实数的一元二次方程一定是实系数方程;
②已知曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2c733432771633fc737e6cb5495787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42dc21975e90b600d266d181f47386a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1d8736a2f5a41c1942f8684ab3a81d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549596ccc06887520511a57b81f33229.png)
③设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a957ce0429c4fead1aeab54e4dc098c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
④设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17af43cc460a6a7010d51a0c9403d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
上述命题中错误的个数是
A.1 | B.2 | C.3 | D.4 |
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解题方法
8 . 已知
是奇函数,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf228a34f7981d88ca9e8ed5cf4d17a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45704a82a6659af0161bca3880c3ce61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249a976e88133f3b3733f09137cf5c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396ed75234b85cdfcae6ca34d3b389db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf228a34f7981d88ca9e8ed5cf4d17a.png)
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9 . 定义集合
,若集合
,集合
,则集合
的子集个数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b3791fba67effbbe360ee4720e59e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522954ce536d559cf03638d87fad504c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6fd27be1b9cfab7495bf2780247b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5eeaa30850a2dd1abcb46208ac8b6a2.png)
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10 . 如图是某公交车线路收支差额y与乘客量x的图像(收支差额=车票收入-支出费用),由于目前线路亏损,公司有关人员提出了两条建议:建议①不改变车票价格,减少支出费用:建议②不改变支出费用,提高车票价格,下面给出四个图像,在这些图像中( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/b9f69dc3-8c18-4844-bec2-04580953a9d8.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f623f430-cf59-4787-99fe-ae49ef43dff3.png?resizew=502)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/b9f69dc3-8c18-4844-bec2-04580953a9d8.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f623f430-cf59-4787-99fe-ae49ef43dff3.png?resizew=502)
A.(1)反映了建议②,(3)反映了建议① | B.(1)反映了建议①,(3)反映了建议② |
C.(2)反映了建议①,(4)反映了建议② | D.(4)反映了建议①,(2)反映了建议② |
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