已知二次函数
与
的图象开口朝上.
(1)当a=1时,讨论函数
的增减性;
(2)若
与
的图象有两个交点为A、B.请求出这两个交点的横坐标;
(3)记
与
的最小值分别为m、n.若m>0,n>0,且mn=4,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867bee7dc020249f1bdee6c24048d663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f6bb8a1e83e300043a5e11994dc8e1.png)
(1)当a=1时,讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(3)记
![](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/18f0281e6bbdbe08beeccb55adf84536.png)
2021·浙江杭州·一模 查看更多[2]
更新时间:2022-04-19 14:27:55
|
相似题推荐
解答题-问答题
|
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名校
【推荐2】如图
,在平面直角坐标系中,矩形
的顶点
在
轴上,顶点
在
轴上,已知点
,
,且
,
是关于
的方程
的两个根
,点
是
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/dc26d396-96d9-492f-bfd3-526f68bc3b53.png?resizew=366)
(1)求点
的坐标;
(2)若反比例函数
的图象经过点
,点
为
轴上一点,点
为反比例函数图象上一点,是否存在点
,使以
,
,
,
为顶点的四边形是平行四边形?若存在,请求出
点的坐标,若不存在,请说明理由;
(3)如图
,在线段
上取点
,使得
,
是线段
上的一动点,
是双曲线
与线段
的交点,且满足
,当
取得最小值时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/197011a724e13d30d80537dc5bc7194a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47cb66da86704cbbb985fd0b0b6c08c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037dca40a7927d312154f895608d3d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf65474e8b95de22d1d662d61bfb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/dc26d396-96d9-492f-bfd3-526f68bc3b53.png?resizew=366)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7385795d7eab9691e21172c51a97428.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3337a55db68cb6eb7d3b4afd8c9e354b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc563bd7655e21bdcc430ebdb658c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a01405ef59edee44326ada3a346f0010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】在平面直角坐标系中,抛物线y=x2+bx+c过(﹣1,0)和(0,﹣3)两点,点M(a,y1),N(a+1,y2)为该抛物线上两点.
(1)抛物线的解析式为 ;
(2)过点M作y轴的垂线,过点N作x轴的垂线,两条垂线交于点Q,当△MNQ为等腰直角三角形时,求a的值;
(3)抛物线在M,N两点之间的部分为图象G(含M,N两点),若图象G上最高点与最低点的纵坐标之差为h,求h关于a的函数解析式,并直接写出自变量a的取值范围.
(1)抛物线的解析式为 ;
(2)过点M作y轴的垂线,过点N作x轴的垂线,两条垂线交于点Q,当△MNQ为等腰直角三角形时,求a的值;
(3)抛物线在M,N两点之间的部分为图象G(含M,N两点),若图象G上最高点与最低点的纵坐标之差为h,求h关于a的函数解析式,并直接写出自变量a的取值范围.
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【推荐2】如图,二次函数y=2mx2+5mx﹣12m(m为参数,且m<0)的图象与x轴交于点A、B,与y轴交于点C,点A的坐标为(﹣4,0).
(1)求直线AC的解析式(用含m的式子表示).
(2)若m=﹣
,连接BC,判断∠CAB和∠CBA的数量关系,并说明理由.
(3)在(2)的条件下,设点M为AC上方的抛物线上一动点(与点A,C不重合),以M为圆心的圆与直线AC相切,求⊙M面积的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/676be8c7-0777-48d7-b091-6f5b70914028.png?resizew=395)
(1)求直线AC的解析式(用含m的式子表示).
(2)若m=﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
(3)在(2)的条件下,设点M为AC上方的抛物线上一动点(与点A,C不重合),以M为圆心的圆与直线AC相切,求⊙M面积的取值范围.
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【推荐1】已知抛物线
:
经过点
.
(1)求抛物线
的函数表达式;
(2)将抛物线向下平移
个单位长度得到新抛物线
,若新抛物线
与坐标轴有两个交点,求
的值;
(3)
,
为抛物线
上两点
点
在点
的右侧
,点
到对称轴的距离为
个单位长度,点
到对称轴的距离为
个单位长度,
为抛物线
上点
,
之间
含点
,
的一点个动点,求点
的纵坐标
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e3c2f88f90a17961d24d9086e27c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
(2)将抛物线向下平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1f07948e9258b482a2164ac871f90f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073ac004ad45cfeda6d5cbebde5ca644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6cfbe589feebb9e804d167667e4645.png)
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【推荐2】如图,∠ABC=45°,△ADE是等腰直角三角形,AE=AD,顶点A、D分别在∠ABC的两边BA、BC上滑动(不与点B重合),△ADE的外接圆交BC于点F,点D在点F的右侧,O为圆心.
(1)求证:△ABD≌△AFE
(2)若AB=4
,8
<BE≤4
,求⊙O的面积S的取值范围.
(1)求证:△ABD≌△AFE
(2)若AB=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.png)
![](https://img.xkw.com/dksih/QBM/2017/3/26/1652311885275136/1659310094565376/STEM/0937e9272d8d45bb9236792dab1d7b39.png?resizew=159)
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真题
名校
【推荐1】在平面直角坐标系
中,抛物线
与
轴交于点A,将点A向右平移2个单位长度,得到点B,点B在抛物线上.
(1)求点B的坐标(用含
的式子表示);
(2)求抛物线的对称轴;
(3)已知点
,
.若抛物线与线段PQ恰有一个公共点,结合函数图象,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde797adc10059c12522072cd85582ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求点B的坐标(用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求抛物线的对称轴;
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae31e3691682182fb0a960ba380f5e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3aad8bd7a7f5a1bff9ee176efbcadd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】定义:点
是平面直角坐标系内一点,将函数
的图像位于直线
左侧部分,以直线
为对称轴翻折,得到新的函数
的图像,我们称函数
是函数
的相关函数,函数
的图像记作
,函数
的图像未翻折的部分记作
,图像
和
合起来记作图像
.
的解析式为
,当
时,它的相关函数
的解析式为
.
(1)如图,函数
的解析式为
,当
时,求它的相关函数
的解析式.
(2)函数
的解析式为
,当
时,图像
上某点的纵坐标为
,求该点的横坐标.
(3)已知函数
的解析式为
,点
、
的坐标分别为
、
,图像
与线段
只有一个公共点时,结合函数图像,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc4682b0b42077347b457bec505b6b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c184c17e35b98fe8094cebe9522e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e782d323e4afcdaa0395577868c6d1ba.png)
(1)如图,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9118cc77fc0a045337745890e50cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aed39f5aca78934fb383402433fe549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dea1bd3d0dd84b8b6f6ff634c5600c.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8684443809254c64330bb349b473bda5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fff76456e4080c41c51661171c66f.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/4772c835cbe626040ecc4df30e6f0ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9357039216543af70e99baff3aa8d7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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