对实数a,b,定义运算“*”为:a*b=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc684bbe56d5202470264a113a15387.png)
(1)求函数y=x*(2x﹣1)的解析式;
(2)若点A(x1,y1)、B(x2,y2)(x1<x2)在函数y=x*(2x﹣1)的图象上,且A、B两点关于坐标原点成中心对称,求点A的坐标;
(3)关于x的方程x*(2x﹣1)=m恰有三个互不相等的实数根x1,x2,x3,且x1<x2<x3,设t=x1+2x2+x3+x1x2x3,则t的取值范围是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc684bbe56d5202470264a113a15387.png)
(1)求函数y=x*(2x﹣1)的解析式;
(2)若点A(x1,y1)、B(x2,y2)(x1<x2)在函数y=x*(2x﹣1)的图象上,且A、B两点关于坐标原点成中心对称,求点A的坐标;
(3)关于x的方程x*(2x﹣1)=m恰有三个互不相等的实数根x1,x2,x3,且x1<x2<x3,设t=x1+2x2+x3+x1x2x3,则t的取值范围是 .
更新时间:2020-02-04 09:14:00
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【推荐1】我们把与x轴有两个不同交点的函数称为“五好函数”,交点称为“五好点”,两交点间的距离称为“五好距”.
(1)判断下列函数是“五好函数”吗? 如果是,请在括号里打“
”,如果不是则打“
”;
,
;
(2)求出“五好函数”
的“五好距”;
(3)①已知“五好函数”
左侧的“五好点”位于
和
之间(含 A,B 两点),求 a 的取值范围;
②不论m取何值,不等式
恒成立,在①的条件下,函数
(b为常数)的最小值为
,求b的值.
(1)判断下列函数是“五好函数”吗? 如果是,请在括号里打“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dcecbc2e704e8aaec3541a045d8698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/801f8ffca94674b6d6411a3b2c7154a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d57b929649adf6606323fdadaff42fb.png)
(2)求出“五好函数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f892e1fe6e0c528cd0672d7ef4d78e84.png)
(3)①已知“五好函数”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d639b89d07b541168f5d5158b964f214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fe2c124d5bbbbe666ee145cd454b6b.png)
②不论m取何值,不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a5e06acb1d8e757e35f9fa70c944d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8b8f6ff7f611adb92cf89c2248bdf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489cb25ea2d9af284bb0f022c3d6e477.png)
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名校
【推荐2】如图,顶点为M的抛物线
与
轴交于
,
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/06904906-d243-4576-a97c-7de403a1d78b.png?resizew=118)
(1)求抛物线
顶点
的坐标;
(2)平移抛物线
得到新抛物线
,使得新抛物线
经过原点
,且与
轴另一交点为E,若
为直角三角形,请求出满足条件的新抛物线
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18347206d3a940f21d914c504027da87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42f05b013e4b7166cbc87c5a83d6a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/06904906-d243-4576-a97c-7de403a1d78b.png?resizew=118)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)平移抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8360794073550419ab8ee5efa138948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
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【推荐1】学习完二次函数后,某班“数学兴趣小组”的同学对函数
的图象和性质进行了探究,在经历列表、描点、连线步骤后得到其图象如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/98ee8218-8080-47d3-b7a4-f4656109a25e.png?resizew=217)
请根据函数图象完成以下问题:
(1)观察发现:
①写出该函数的一条性质_________________;
②函数图象与x轴有_________个交点,所以对应的方程
有________个实数根;
(2)分析思考:
③方程
的解为__________________;
④关于x的方程
有4个实数根时,n的取值范围是_________;
(3)延伸探究:
⑤将函数
的图象经过怎样的平移可以得到函数
的图象,直接写出平移过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edafa7ca4c640d3e49eab717b163fd65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/98ee8218-8080-47d3-b7a4-f4656109a25e.png?resizew=217)
请根据函数图象完成以下问题:
(1)观察发现:
①写出该函数的一条性质_________________;
②函数图象与x轴有_________个交点,所以对应的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d04d29271bc5fb5abf9ece17144524.png)
(2)分析思考:
③方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ee96358a38c8dcc1d4fea5fa26dce1.png)
④关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd7f8fb9974ea53a77a7c688e77935a.png)
(3)延伸探究:
⑤将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edafa7ca4c640d3e49eab717b163fd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/861ae97d63843dfa08e8c6b05082aa36.png)
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【推荐2】已知抛物线
经过点
,关于直线
成轴对称.设抛物线
与函数
图象的交点(交点也称公共点)的横坐标为d.
,
.
(1)求抛物线的解析式;
(2)以下结论:
,
,
,你认为哪个正确?并证明你认为正确的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53be61cd85ec86aabd164cae0265246b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53be61cd85ec86aabd164cae0265246b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b383902b911e813c7112b45dc495af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f396b77f3b84b46eb5cbd8e595f69896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba71c8dc67cc89de1a4953c17e923fb.png)
(1)求抛物线的解析式;
(2)以下结论:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2df1d95b9dd6b065156b535d14e6e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a4480988244a9d04ec293975db2cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
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解题方法
【推荐1】如图1,抛物线y=x2﹣4mx+4m2+2m﹣4(m是常数)的顶点为P,直线l:y=x﹣4.
![](https://img.xkw.com/dksih/QBM/2022/2/2/2907678711365632/2936820394131456/STEM/fa91fd1c-5265-4dd9-b634-956295e3675c.png?resizew=520)
(1)求证:点P在直线l上.
(2)若m<0,直线l与抛物线的另一个交点为Q,与y轴交点为H,Q恰好是线段PH的中点,求m的值.
(3)如图2,当m=0时,抛物线交x轴于A、B两点,M、N在抛物线上,满足MA⊥NA,判断MN是否恒过一定点,如果过定点,求出定点坐标;如果不过定点,说明理由.
![](https://img.xkw.com/dksih/QBM/2022/2/2/2907678711365632/2936820394131456/STEM/fa91fd1c-5265-4dd9-b634-956295e3675c.png?resizew=520)
(1)求证:点P在直线l上.
(2)若m<0,直线l与抛物线的另一个交点为Q,与y轴交点为H,Q恰好是线段PH的中点,求m的值.
(3)如图2,当m=0时,抛物线交x轴于A、B两点,M、N在抛物线上,满足MA⊥NA,判断MN是否恒过一定点,如果过定点,求出定点坐标;如果不过定点,说明理由.
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【推荐2】阅读下列材料:
在九年级下册“5.2二次函数的图像和性质”课时学习中,我们发现,函数:
中
的符号决定图像的开口方向,
决定图像的开口大小,为了进一步研究函数的图像和性质,我们作如下规定:如图
,抛物线上任意一点(
)(异于顶点
)到对称轴的垂线段的长度(
的长度)叫做这个点的“勾距”,记作
;垂足(
)到抛物线的顶点(
)的距离(
)叫这个点的“股高”,记作
;点(
)到顶点(
)的距离(
的长度)叫这个点的“弦长”,记作
;过这个点(
)和顶点(
)的直线(
)与对称轴(
)相交所成的锐角叫做这个点的“偏角”,记作
.
由图1可得,对于函数
:
(1)当勾距
为定值时
①
;股高和弦长均随
增大而增大;
②
;偏角随
增大而减小;
(如:函数
中,当
时,
;
)
(2)当偏角
为定值时
,勾距、股高和弦长均随
增大而减小;
(如:函数
中,当
时,
、
)
利用以上结论,完成下列任务:
如图2:已知以
为顶点的抛物线
与
轴相交于点
,若抛物线
的顶点也是
,并与直线
相交于点
,与
轴相交于点
.
(1)函数
中,①当
时,
________,②当
时,
________;
(2)如图2:以
为顶点作抛物线:
和
与
轴相交于点
与直线
相交于点
,与
轴相交于点
:
①当
时,设
,随
的取值不同,
的值是否发生改变,如果不变,请求出
的值,如果发生改变,请直接写出
的取值范围;
②若点M在抛物线
上,直线
与
的另一个交点为
,记
的面积为
,
的面积为
,若
,请求出
的值
在九年级下册“5.2二次函数的图像和性质”课时学习中,我们发现,函数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64821ae29c0539ca5e7492abc8b4fe50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/69f3024d-5186-4e20-91e9-b218f5c44dea.png?resizew=371)
由图1可得,对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f3023b526438933a05bed6f671730d.png)
(1)当勾距
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c67b92af22dfe333ba783d69e6a84d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7b00f7eeb35d01fcd7a24ece1d91db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
(如:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36b419678ab14675ac01815b822b484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe90cfe0c6a51e508a0928d940b2f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3fd0eeb5f658c765d8c8295122148c6.png)
(2)当偏角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9732f8dd3db1bc88f9dd2b732ac96e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8d40e257f9c446b8e30fa841b74bbd.png)
(如:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8c329e0427cdecc47aa63bea9a5e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b0f355fef6396f59533a755acdbe48.png)
利用以上结论,完成下列任务:
如图2:已知以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90859a62adc47a78418bcbee8d2b888a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a97bfdc69eb2d22f1469d68294328b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108c18cb76d7d34b05c991a644c8b136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb70883828ee231b42167ca909d4f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050294162a78c6f4d6a87849bd3049a3.png)
(2)如图2:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90859a62adc47a78418bcbee8d2b888a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53148fd88ef375a1b5fa0bcc2f91618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5623079e8aba96b38803d41671a9aaf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e189dbc979fad6bf8ca03ac1388cbac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/406548746db26cb4dfb5995beaad9dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
②若点M在抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94173bc376094fed682f27d764c8829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99db03404e48d64e11ad9e953e874ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37dce3065089e3b1511b16cf8738dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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