如图,抛物线y=
x2+bx-2与x轴交于A、B两点,与y轴交于C点,且A(一1,0).
(1)求抛物线的解析式及顶点D的坐标;
(2)判断△ABC的形状,证明你的结论;
(3)点M是x轴上的一个动点,当△DCM的周长最小时,求点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/4d7b471a-0c3f-4b64-ab71-7f7cd7aafdd3.png?resizew=163)
(1)求抛物线的解析式及顶点D的坐标;
(2)判断△ABC的形状,证明你的结论;
(3)点M是x轴上的一个动点,当△DCM的周长最小时,求点M的坐标.
更新时间:2020-05-26 23:38:14
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【推荐1】如图,抛物线
经过
,与
轴交于点C,过点C作
轴,交抛物线于点B,连接AC、AB,AB交y轴于点D,若
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/7609e5e6-98a5-4189-88f3-431b155f437c.png?resizew=195)
(1)求点
的坐标;
(2)点P为抛物线对称轴上一点,且位于x轴上方连接PA、PC,若
是以AC为直角边的直角三角形,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/527adf33876b600568772d6ff0a91310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2146aec59309d1544ece1d028a17e394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ca96b690ff991fdf8a10a7f4d0173f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/7609e5e6-98a5-4189-88f3-431b155f437c.png?resizew=195)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)点P为抛物线对称轴上一点,且位于x轴上方连接PA、PC,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
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真题
【推荐2】已知二次函数
.
(1)若
,且该二次函数的图像过点
,求
的值;
(2)如图所示,在平面直角坐标系
中,该二次函数的图像与
轴交于点
,且
,点D在
上且在第二象限内,点
在
轴正半轴上,连接
,且线段
交
轴正半轴于点
,
.
.
②当点
在线段
上,且
.
的半径长为线段
的长度的
倍,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd69aebdafb31468eb13ce3b28a36e47.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9229a8936dd681b8cde39ae97839fc14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)如图所示,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fc2f7817a326a17446801ccbca547c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810121965806b2e97fc43122ef5e200e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7b0c34c4a6e7be6f08ef7b7829c4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.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/c58f3c18996cf7ee90701715c97ba343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325ac25ad323b387dfe03cdda7311e92.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632ad3364c10f8c551d826e94018b0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0113fd4c7d157757571f9a009e02af.png)
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【推荐1】在正方形
中,点
为射线
上的一个动点,点
在射线
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/ee300118-e53d-4962-b2af-ab5973237f9c.png?resizew=380)
(1)如图1,当点
在边
上时,请直接写出
、
、
三条线段之间的数量关系;
(2)如图2,当点
在边
的延长线上时,请你判断
、
、
三条线段之间的数量关系,并说明理由;
(3)如图3,若
,点
在边
上,且
,点
为
的中点,在点
从点
沿射线
运动的过程中,
的周长的最小值为___________(直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/ee300118-e53d-4962-b2af-ab5973237f9c.png?resizew=380)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6cee83d36c4da913e0790e5070c46f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】如图,点
,
在反比例函数
的图象上,
轴于点
,
轴于点
,
.
(1)求
,
的值并写出反比例函数的表达式;
(2)连接
,已知在线段
上存在一
点,使
的面积等于5,请求出点
的坐标.
(3)设
是
轴上的一个动点,是否存在点
使得的
的周长最小?若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3956b653921dff43c77ce15f89e6944.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40560ea08d6cd8c1d4d9661ee6faaa3b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2694c32ca1e120e988012b7ecd74f625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/a75de7bd-8f5f-44cc-92c8-02977e398e4f.png?resizew=182)
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【推荐1】如图,在平面直角坐标系中,直线
与
轴,
轴分别相交于
两点,
,
,直线
与直线
交于点
.
的解析式;
(2)判断
的形状,并说明理由;
(3)动点
在直线
上,动点
在直线
上,当以
为顶点的四边形是平行四边形时,求
两点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d501afbd7542f2f724b658edf39af4.png)
![](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/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9419302c045670b2f7384d6b0e7b7738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147fbf22b57bd43a3ce40955c97ff652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b9f0b9e53a83e68f5fec944f343119.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
(3)动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee0512487af4b4246fcd704fc04420d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ad58997b9dc0b341c9af08f0cd1fbe.png)
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【推荐2】如图,在平面直角坐标系中,直线
与y轴交于点A,与直线
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/a0e8e5cf-3ab1-4f79-a57b-a02a858d4f9e.png?resizew=365)
(1)求m和b的值;
(2)求证:
是直角三角形;
(3)直线
上是否存在点D,使得
,若存在,请求出点D的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a47ab5a604e0a8fb9af1e53f2a9b3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/687af2a036f33025986c48912e267254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49753619c62e49d6375aa8a7059cbd09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/a0e8e5cf-3ab1-4f79-a57b-a02a858d4f9e.png?resizew=365)
(1)求m和b的值;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4118371d533ddb58493abcaf8dcb9.png)
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【推荐1】已知抛物线
的顶点为D,与x轴交于A,B两点(A在B左边).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/3/4b4d3188-f928-47b0-8fe5-4695564bab80.png?resizew=275)
(1)若该抛物线的顶点D坐标为
,求其解析式;
(2)如图(1),在(1)的条件下,P,Q为y轴上的两个关于原点对称的动点,射线
,
分别与抛物线交于M,N两点,求
的值.
(3)如图(2),已知抛物线的顶点D在直线
上滑动,且与直线l交于另一点E,若
的面积为
,求抛物线顶点D的坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645a25c24a192e2865a4a4a240612192.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/3/4b4d3188-f928-47b0-8fe5-4695564bab80.png?resizew=275)
(1)若该抛物线的顶点D坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69abe959988e4c8c0739f5857ccfb0f.png)
(2)如图(1),在(1)的条件下,P,Q为y轴上的两个关于原点对称的动点,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2cb1c15aeec5890c000feee828a094a.png)
(3)如图(2),已知抛物线的顶点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4597737b444f53a1b83c097885c48fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0703b052d85a1fb24f0079021abbfb6.png)
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【推荐2】已知抛物线
与x轴交于
两点,且与y轴的公共点为点C,设该抛物线的顶点为D.
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105284623253504/3106667625046016/STEM/5411b052b6994ed6bf8989c4b6846648.png?resizew=447)
(1)求抛物线的表达式,并求出顶点D的坐标;
(2)若点P为抛物线上一点,且满足
,求点P的横坐标;
(3)连接
,点E为线段BC上一点,过点E作
交
于点F,若
,求点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cc58f66e7c8088eaacb2281d152fe9a.png)
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105284623253504/3106667625046016/STEM/5411b052b6994ed6bf8989c4b6846648.png?resizew=447)
(1)求抛物线的表达式,并求出顶点D的坐标;
(2)若点P为抛物线上一点,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ee4e9fd32019f9264c0f7f44615808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6cc3789c0e9b7d1226aa0de3327599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c3a57ef5d60f663a053ed7a2ec3055.png)
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