已知函数
过点
,且当
和
时的函数值相等.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/4a70562c-c00a-4131-b982-c9bd12577e57.png?resizew=168)
(1)求函数
的表达式,并画出它的图象(不要求列表);
(2)定义函数
,若关于x的方程
有且仅有三个不等的实根,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc18c2c0e68c01599e000ed2417eb15d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0924ff22fff9f5639feb0ceeece80d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/4a70562c-c00a-4131-b982-c9bd12577e57.png?resizew=168)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc18c2c0e68c01599e000ed2417eb15d.png)
(2)定义函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/220a32059739f476569aca56672308db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eca0b64bb0fbfbcf6bcc2926f401aab.png)
更新时间:2022-12-18 08:50:12
|
相似题推荐
解答题-应用题
|
适中
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【推荐1】某工厂计划投资生产
两种产品,根据市场调查与预测,产品
的利润
(万元)与投资量
(万元)成正比例关系,如图①所示:产品
的利润
(万元)与投资量
(万元)成顶点在原点的二次函数关系,如图②所示.
(1)请直接写出利润
与
关于投资量
的函数关系式
________,
________;
(2)如果工厂以9万元资金投入生产
两种产品,要求
产品的投资金额不超过
的2倍,且不少于3万元,则如何投资该工厂能获得最大利润?最大利润是多少?
(3)在(2)问的情况下,工厂要获得不低于18万的利润,工厂要如何投资?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/f95f3b84-1779-4542-ac05-e0040d723ebc.png?resizew=344)
(1)请直接写出利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f6ae805e69e5c04728f976047dad58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b54e384a072508d4754e0f1636f8f66.png)
(2)如果工厂以9万元资金投入生产
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)在(2)问的情况下,工厂要获得不低于18万的利润,工厂要如何投资?
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【推荐2】如图,抛物线
与x轴交于A,B两点,y与轴交于点C,抛物线的对称轴交x轴于点D.已知A(-1 ,0),C(0,3).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/7bea647a-8bfe-4892-ac19-bbde07a5c06f.png?resizew=138)
(1)求抛物线的解析式;
(2)在抛物线的对称轴上有一点M,使得MA+MC的值最小,求此点M的坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/7bea647a-8bfe-4892-ac19-bbde07a5c06f.png?resizew=138)
(1)求抛物线的解析式;
(2)在抛物线的对称轴上有一点M,使得MA+MC的值最小,求此点M的坐标;
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名校
【推荐1】对于抛物线
.
(1)它与
轴交点的坐标为______________,与
轴交点的坐标为______________,顶点坐标为______________;
(2)在坐标系中利用描点法画出此拋物线;
(3)根据图象回答:
时,
的取值范围是______________;
(4)利用以上信息解答下列问题:若关于
的一元二次方程
(
为实数)在
的范围内有解,则
的取值范围是______________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fff76456e4080c41c51661171c66f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/7bf112ed-c862-4fd8-9572-3aca8736eba3.jpg?resizew=202)
![]() | … | … | |||||
![]() | … | … |
(1)它与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)在坐标系中利用描点法画出此拋物线;
(3)根据图象回答:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(4)利用以上信息解答下列问题:若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6c25bae7e77e3dd22d4205bd821777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ef7e6ee636377f9f5b2390aadfef99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-作图题
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(0.65)
【推荐2】设二次函数
(
,是实数).已知函数值和自变量
的部分对应取值如表所示:
(1)求此二次函数的解析式.
(2)
______,
______,并在图中画出二次函数的图象.
(3)当
时,则
的取值范围为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929925842ca723b34647ccaa596cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | … | ![]() | 0 | 1 | 2 | 3 | … |
![]() | … | 4 | 1 | 0 | ![]() | ![]() | … |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/63379e32-60c6-4125-bafa-aca67a4e15ed.png?resizew=122)
(1)求此二次函数的解析式.
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b94f151c00959a1cd3946e7f8405337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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【推荐1】已知抛物线
顶点在第三象限,顶点纵坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/ca1503e7-949d-4f56-86ac-6430c4cfb4cc.png?resizew=192)
(1)求抛物线的函数表达式和顶点坐标.
(2)若图像与
轴的交点为
、
,与
轴的交点
,求
的面积;
(3)直接回答:
①当
取何值时,函数值大于0?______
②当
取何值时,函数值
随
的增大而增大?______
③若点
是抛物线上一点,直线
的函数表达式为
,满足
的
的取值范围是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac100d3b7c4f814445c50ee685fcb53a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/ca1503e7-949d-4f56-86ac-6430c4cfb4cc.png?resizew=192)
(1)求抛物线的函数表达式和顶点坐标.
(2)若图像与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
(3)直接回答:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
③若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6594c8729db5f6ff7bc9c367c78fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea8578000985b74cbcaa3de6e14cb26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac67e9a909472ab852d38d2ec66a1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-问答题
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【推荐2】阴阳观念是具有鲜明中国特色的哲学思想,它几乎渗透到社会生活、文学艺术、医学等许多方面,以至形成“阴阳对偶律”.比如说“阴阳对偶律”导致左右相对的形式在中国装饰艺术中地位突出.对偶的神兽或神人往往相对而列.多半会形成左右相对(包含左右对称)的样式.对偶在数学上也多有渗透,下面我们就研究下多项式中的对偶.
定义:对于关于
的多项式,若当
取任意一对互为相反数的数时,该多项式的值相等,就称该多项式关于
对偶,例如:当
时,即
或
时,
的值均为
.那么我们称
关于
对偶.在学习二次函数时,我们知道二次函数
的对称轴是直线
,从“形”的角度看,多项式
的对偶即二次函数
图像的对称性.
运用此定义解决下列问题:
(1)多项式
关于________对偶;
(2)当
或
时,关于
的多项式
的值相等,求
的值;
(3)若整式
关于
对偶,求
的值.
定义:对于关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1c15dc9d5a62169030cbfd4f610bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95937606d7827055e2617f7e93a01920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b220e36c75e7458ebbb95a957baac31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b220e36c75e7458ebbb95a957baac31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9899f0d5da0044b254ecafc125679553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b220e36c75e7458ebbb95a957baac31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9899f0d5da0044b254ecafc125679553.png)
运用此定义解决下列问题:
(1)多项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8434db94ccb0a7e81c917fcb411b091d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6361c416d3fb372d343e10ff99b5be27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665af1d334f74ba57551c40f9474624d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)若整式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7e285e40d3656928dd6fd7c4f2577d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1be7302f2e9ff02fee3fcf26e77b1c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-证明题
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适中
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【推荐1】已知抛物线 y 3ax 2 2bx c,
(1)若 a b1, c 1求该抛物线与 x 轴的交点坐标;
(2)若 a+b+c 1,是否存在实数 x0,使得相应的 y=1,若有,请指明有几个并证明你的结论,若没有,阐述理由.
(1)若 a b1, c 1求该抛物线与 x 轴的交点坐标;
(2)若 a+b+c 1,是否存在实数 x0,使得相应的 y=1,若有,请指明有几个并证明你的结论,若没有,阐述理由.
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【推荐2】阅读下面的材料:
在同一直角坐标系中,判断两个函数的图象有无交点、交点的个数以及交点的坐标时,可以将问题转化为方程或方程组的解的问题.
如果两个函数的图象有交点,则它们的解析式组成的方程或方程组有解,且交点的个数等于解的个数.对于方程组来说,
的解是交点的横坐标,
的解是交点的纵坐标(两个函数都是
关于
的函数).
根据以上材料,解决下面的问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/6536f5fe-46f1-4bb4-aed8-178b28fa3255.png?resizew=513)
(1)函数
与
的图象如图1所示,则方程
有______个实数根,分别为_______;
(2)已知函数
的图象如图2所示.
①若方程
有三个实数根,则
的值是_______;
②若方程
有四个不相等的实数根,则
的取值范围是_______;
③若方程
有两个不相等的实数根,则
的取值范围是______.
(3)已知抛物线
与直线
的图象只有一个公共点,求实数
的值.
在同一直角坐标系中,判断两个函数的图象有无交点、交点的个数以及交点的坐标时,可以将问题转化为方程或方程组的解的问题.
如果两个函数的图象有交点,则它们的解析式组成的方程或方程组有解,且交点的个数等于解的个数.对于方程组来说,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
根据以上材料,解决下面的问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/6536f5fe-46f1-4bb4-aed8-178b28fa3255.png?resizew=513)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582f4466f8fd4c2998e1c9095db1b5d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b84dc4074f5b6ff36b7719f4679ca6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec1ea106f19bd610cf8f7abda13c17b.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a68591cf3ce4c7634dcc801711fad0d.png)
①若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d0296803ad4de56102400f926e515f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d0296803ad4de56102400f926e515f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
③若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d0296803ad4de56102400f926e515f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8f2ffa8f1b85c0fb5c3ac7ade6162.png)
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