如图,二次函数
的图象与x轴相交于点A和点
,与y轴相交于点
.
![](https://img.xkw.com/dksih/QBM/2021/12/28/2884499154427904/2948626124718080/STEM/af1decc3-c191-4b83-9b0e-d2f2da5ecfc3.png?resizew=162)
(1)求二次函数的表达式及A点坐标;
(2)D是二次函数图象上位于第三象限内的点,求当△DAC的面积最大时点D的坐标;
(3)M是二次函数图象对称轴上的点,在二次函数图象上是否存在点N,使以点M、N、B、O为顶点的四边形是平行四边形?若存在,请直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f998f27d8fc98ad8733bbcc3be0f482a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://img.xkw.com/dksih/QBM/2021/12/28/2884499154427904/2948626124718080/STEM/af1decc3-c191-4b83-9b0e-d2f2da5ecfc3.png?resizew=162)
(1)求二次函数的表达式及A点坐标;
(2)D是二次函数图象上位于第三象限内的点,求当△DAC的面积最大时点D的坐标;
(3)M是二次函数图象对称轴上的点,在二次函数图象上是否存在点N,使以点M、N、B、O为顶点的四边形是平行四边形?若存在,请直接写出点N的坐标;若不存在,请说明理由.
更新时间:2022-04-01 08:58:07
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【推荐1】学习了二次函数后,我们发现抛物线的形状由二次函数的二次项系数决定.已知抛物线
.
在直线
下方的图象沿该直线翻折,其余部分保持不变,得到一个新的函数图象“W”.翻折后,抛物线顶点A的对应点
恰好在x轴上,求抛物线
的对称轴及a的值;
(2)如图2,抛物线
的图象记为“G”,与y轴交于点B;过点B的直线与(1)中的图象“W”
交于P,C两点,与图象“G”交于点D.
①当
时,求证:
;
②当
时,请用合适的式子表示
(直接写结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9fea95c3ef08773129587e41e89c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee71580ab49b5fb39fd9d44526b4a600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6280959e386eed67ce5d6f8da5dcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee71580ab49b5fb39fd9d44526b4a600.png)
(2)如图2,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b9fea95c3ef08773129587e41e89c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705c5e25f7a0a7b25eb7f8f3e0ca17e4.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd82b5223c2a708c1729db2a3750990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3bda5aadfb41cf63b4e1be3d40fa1c.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe079666438476840b6f17283200de1.png)
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【推荐2】已知二次函数y=ax2+bx-3经过A(-1,0),B(3,0)两点,
(1)求二次函数解析式及对称轴方程;
(2)连接BC,交对称轴于点E,求E点坐标;
(3)在y轴上是否存在一点M,使△BCM为等腰三角形,若存在,直接写出点M的坐标,若不存在,请说明理由;
(4)在第四象限内抛物线上是否存一点H,使得四边形ACHB的面积最大,若存在,求出点H坐标,若不存在,说明理由.
(1)求二次函数解析式及对称轴方程;
(2)连接BC,交对称轴于点E,求E点坐标;
(3)在y轴上是否存在一点M,使△BCM为等腰三角形,若存在,直接写出点M的坐标,若不存在,请说明理由;
(4)在第四象限内抛物线上是否存一点H,使得四边形ACHB的面积最大,若存在,求出点H坐标,若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2017/5/27/1696076850323456/1696262466945024/STEM/cc5232ca-8ef5-4975-b60b-e5624b5db33b.png?resizew=462)
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【推荐1】如图,已知
是边长为
的等边三角形,动点P,Q同时从A、B两点出发,分别沿
匀速运动,其中点P运动的速度是
,点Q运动的速度是
,当点Q到达点C时,P、Q两点都停止运动,设运动时间为
,解答下列问题:
的面积为
,求S与t的函数关系式;
(2)作
交
于点R,连接
,当t为何值时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ec556703fc98d32003759064c20b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba95116dc790b935d65bf540799cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d744165d6aad705f64de41a9d931750a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f372e567a416d3dc405b2b0d72506b3.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b42350f196d788dff8d5c4fe50a8900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f07ae18d892535d0f0bce92190206d.png)
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【推荐2】如图,二次函数y=
x2﹣x+c的图象与x轴分别交于A、B两点,顶点M关于x轴的对称点是M′.
(1)若A(﹣4,0),求二次函数的关系式;
(2)在(1)的条件下,求四边形AMBM′的面积;
(3)是否存在抛物线y=
x2﹣x+c,使得四边形AMBM′为正方形?若存在,请求出此抛物线的函数关系式;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
(1)若A(﹣4,0),求二次函数的关系式;
(2)在(1)的条件下,求四边形AMBM′的面积;
(3)是否存在抛物线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://img.xkw.com/dksih/QBM/2012/8/9/1573481803620352/1573481834889216/STEM/52fa3c33744049ef835be437eb4e5be5.png)
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【推荐1】如图,抛物线经过A(﹣1,0),B(0,﹣4),D(3,﹣4)三点.
(1)求抛物线的解析式.
(2)直线AD交y轴于点G,M是线段GD上动点,MN//x轴与抛物线CD段交于点N.MF⊥x轴于F,NH⊥x轴于H,当四边形MFHN是正方形时,求点M的坐标.
(3)探究在抛物线上是否存在点P,使S△PBC=2S△DBC?若存在,请求出点P的坐标;若不存在,试说明理由.
(1)求抛物线的解析式.
(2)直线AD交y轴于点G,M是线段GD上动点,MN//x轴与抛物线CD段交于点N.MF⊥x轴于F,NH⊥x轴于H,当四边形MFHN是正方形时,求点M的坐标.
(3)探究在抛物线上是否存在点P,使S△PBC=2S△DBC?若存在,请求出点P的坐标;若不存在,试说明理由.
![](https://img.xkw.com/dksih/QBM/2021/8/17/2787870915207168/2788128233586688/STEM/5f41c63c9e6c43cf85104b7d91e9eeae.png?resizew=344)
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【推荐2】如图,一条顶点坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ff845eef441001ae1b447639a0ba63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292b791c7cf21c172e6e7f97f04be176.png)
的抛物线与
轴交于点
,与
轴交于点
和点
,有一宽度为
,长度足够的矩形
阴影部分
沿
轴方向平移,与
轴平行的一组对边交抛物线于点
和
,交直线
于点
和
,交
轴于点
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/3/14/3194290027732992/3194381507952640/STEM/3f57c1b3adce458bbd8227e9b1923ea5.png?resizew=246)
(1)求抛物线的解析式;
(2)当点
和
都有在线段
上时,连接
,如果![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050a400ef5900c4a69b4d3270b0b4ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff52c77adf05c185484b4fbdb7796ce.png)
,求点
的坐标;
(3)在矩形的平移过程中,当以点
,
,
,
为顶点的四边形是平行四边形时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ff845eef441001ae1b447639a0ba63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292b791c7cf21c172e6e7f97f04be176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/3/14/3194290027732992/3194381507952640/STEM/3f57c1b3adce458bbd8227e9b1923ea5.png?resizew=246)
(1)求抛物线的解析式;
(2)当点
![](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/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050a400ef5900c4a69b4d3270b0b4ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/050a400ef5900c4a69b4d3270b0b4ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff52c77adf05c185484b4fbdb7796ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)在矩形的平移过程中,当以点
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐3】如图,在平面直角坐标系中,抛物线
与y轴交于点C,与x轴交于点A、B,且
,
.
(1)求抛物线的表达式;
(2)如图1,点P为线段
上方抛物线上的任意一点,过点P作
轴交
于D,
交直线
于点G,求
的最大值及此时点P的坐标;
(3)如图2,将抛物线沿着水平方向向右平移2个单位长度得到新的抛物线,点E为原抛物线与平移后的抛物线的交点,点M为平移后的抛物线对称轴上的一动点,点N为坐标平面内的一点,是否存在以
为边,以B、E、M、N为顶点的四边形是菱形?若存在,直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ceba6b11658f2cc227b1f550ba25c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/37923f18-0b9c-41f5-a561-5469f261b95c.png?resizew=424)
(1)求抛物线的表达式;
(2)如图1,点P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b32f59522eea44b24cdd4c2bc0406e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbe16a90567bc8adf43d50ae8b0536cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)如图2,将抛物线沿着水平方向向右平移2个单位长度得到新的抛物线,点E为原抛物线与平移后的抛物线的交点,点M为平移后的抛物线对称轴上的一动点,点N为坐标平面内的一点,是否存在以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
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