已知二次函数y=x2+(2m-4)x+m2-4m-5(m是常数,-1<m<5)的图象与x轴交于A,B两点(点A在点B的左边),与y轴负半轴交于点C,
(1)求二次函数的图象顶点Q的坐标;
(2)求△ABC的面积的最大值;
(3)当-3≤x≤2时,函数的最大值为7,求m的值.
(1)求二次函数的图象顶点Q的坐标;
(2)求△ABC的面积的最大值;
(3)当-3≤x≤2时,函数的最大值为7,求m的值.
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179659118960640/2185277391749120/STEM/192e9bf449224c3797df0cef5c6d8107.png?resizew=221)
更新时间:2019-04-18 21:01:08
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【推荐1】如图,已知二次函数
的图象经过点
.
![](https://img.xkw.com/dksih/QBM/2021/3/30/2688977706696704/2689644829933568/STEM/d4c8014e96c545c1947bbf5bf20e6981.png?resizew=179)
(1)求m的值和图象的顶点A的坐标;
(2)点
在该二次函数图象上.
①将点Q向左平移6单位得点
,若
恰好也在抛物线上,求n,t的值;
②将横、纵坐标均为整数的点称为整点,在直线
下方的抛物线上(包括边界)恰好存在7个整点,则t的取值范围是_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ade507a2e9c8d4ca927f009662c0e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dda1d7b3982b398ffa32f3dbfdfe787.png)
![](https://img.xkw.com/dksih/QBM/2021/3/30/2688977706696704/2689644829933568/STEM/d4c8014e96c545c1947bbf5bf20e6981.png?resizew=179)
(1)求m的值和图象的顶点A的坐标;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6acacfabaff4bd2abbe95c7a66c5d92b.png)
①将点Q向左平移6单位得点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
②将横、纵坐标均为整数的点称为整点,在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ff39dd1dfc9caf911ad0d11ba21d66.png)
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【推荐2】如图1,抛物线
与
轴交于点
、
,与
轴交于点
,点
为抛物线的顶点.
的坐标;
(2)如图2,连接
,
为
轴上一点,连接
交
于点
,当
时,求点
的坐标;
(3)如图3,连接
、
,在(1)中的抛物线上是否存在点
,使得
?若存在,直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27994b3bdf5ce44a9e688552087db0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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解题方法
【推荐1】如图,在平面直角坐标系中,抛物线
与抛物线
均经过点
,直线
在这两条抛物线的对称轴之间(不与对称轴重合),函数
的图象记为
函数
的图象记为
图象
与
合起来得到的图形为
.
![](https://img.xkw.com/dksih/QBM/2020/10/2/2562513950957568/2563831234486272/STEM/e7ea46e8-835a-4b55-b6e3-ce8d007823f0.png)
(1)求
的值;
(2)当
时,求图形
上
随
的增大而减小时
的取值范围;
(3)当
时,图形
上最高点的纵坐标为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf038d1fb5b6e0df876be75756a6805.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3081730cee9f66cf04c057aff8f50a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589643c3e13652e42d95ca18da32b165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3244877e98d5a0f18df0bb231cefabc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6eae8a28032a52e80bbcf60ed59928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a404ea54fdbe3ceb67e778ffb41fcf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2020/10/2/2562513950957568/2563831234486272/STEM/e7ea46e8-835a-4b55-b6e3-ce8d007823f0.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1154f6a25bf87c6a1096794395dff17.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8493a0cd10d3d0399173c04163740a38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53037051fd664210a9323413939e70ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】如图1,已知抛物线
经过
,
,
三点,其顶点为
,对称轴与
轴交于点
.
(2)若点
是该抛物线对称轴上的一个动点,求
周长的最小值;[结果保留根号]
(3)如图2,若
是线段
上的一个动点(
与
、
不重合),过
点作平行于
轴的直线交抛物线于点
,交
轴于点
,设点
的横坐标为
,
的面积为
.
①求
与
的函数关系式;
②
是否存在最大值?若存在,求出最大值及此时点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐1】在平面直角坐标系中,若对于任意两点
、
,都有
,则称A、B两点互为“友好点”.已知点
.
(1)若
、
、
,则点A的“友好点”是 ;
(2)若
、
都在双曲线
上,且A、P两点互为“友好点”.请求出点P的坐标;
(3)已知抛物线
(
,a,b,c为常数).顶点为D点,与x轴交于A、B两点,与直线
交于P、Q两点.若满足:①抛物线过点
;②
为等边三角形;③P、Q两点互为“友好点”.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021044b4285c4fd3d5d80bc5bba561b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f1f2b3e349a9be5fb156ae31525b9c.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02af485e17e7628fd5a3ace6e0a32ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b7343be77754db049a3c3b40fe659e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f1f2b3e349a9be5fb156ae31525b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
(3)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f2c3ad1bb8ecf37eed4bf17be2831c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4fc17f0742370da0622bacaeb18d6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec40ff4479edca2ed18b6cadb8db72f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c625a55ef1d2920a0605d52c8da23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a463aaa6e899b9b2d8deace7f4d2dbe.png)
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【推荐2】综合与探究
如图,抛物线
与x轴交于A,B两点,点A在点B左侧,其对称轴交x轴于点F,点
是抛物线上一动点.
(2)已知存在一平行于x轴的直线l,点P到点F的距离与点P到此直线的距离始终相等,设直线l上所有点的纵坐标均为k.
①请求出k的值.
②当
时,作直线
交抛物线于点Q,在直线l上是否存在一点M,使得
是以
为斜边的直角三角形?若存在,请求出点M的坐标;若不存在,请说明理由.
如图,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42a14a7561531d157a4665869f050e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90688751e58655291204fab149e744e3.png)
(2)已知存在一平行于x轴的直线l,点P到点F的距离与点P到此直线的距离始终相等,设直线l上所有点的纵坐标均为k.
①请求出k的值.
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99675fa03da205c4499967c9d908412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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