在平面直角坐标系中,抛物线
经过点
,
.
(1)求这个二次函数的表达式.
(2)当
时,设二次函数
的最大值与最小值的差为
,求
与
之间的函数关系式.
(3)在坐标平面内,动点
在直线
上,当
为直角三角形且恰好存在两个点
时,求
的取值或取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6bbbb53aaeab0ab7a242228cc510fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549f5e607ed8f8812cd9d40b693074fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/46c79e65-4398-4d43-be41-a7dad25157df.png?resizew=148)
(1)求这个二次函数的表达式.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae71c78e10ad76e10dacc58cbbe145f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)在坐标平面内,动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1be7302f2e9ff02fee3fcf26e77b1c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
更新时间:2024-02-26 15:18:19
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相似题推荐
解答题-问答题
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【推荐1】如图,在平面直角坐标系中,点O为坐标原点,抛物线
经过点
,直线
交抛物线于点P,交x轴于点Q,点P关于点Q的对称点为点C,过点P、C分别作
的垂线,交过点A且垂直于x轴的直线于点E、D.
(2)求该抛物线的顶点坐标;
(3)当线段
的长随m值的增大而增大时,求m的取值范围;
(4)抛物线在点P、A之间的部分(包括点P、A)的最低点到x轴的距离记为
,四边形PCDE截该抛物线的图象(包括边界的点)的最低点到x轴的距离记为
,若
,直接写出m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90256b56cde0d3b8ca69864016a363ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)求该抛物线的顶点坐标;
(3)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(4)抛物线在点P、A之间的部分(包括点P、A)的最低点到x轴的距离记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c320f18ff572627af0fa667708265a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713f9c55db6cd4fc76a94b22e81d71e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8e42fcea3511e9011224cb9f8d1d8d.png)
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【推荐2】已知二次函数(a为常数).
(1)若二次函数的图象经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5446710df4c594fc4ed717e6bd36123f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120b6dab105ef5caf08a9fffeb8d6e55.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e46371f310e03a153a1698aad9d4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff5fd5ccf8540fc7692b75c5e2ab00c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】综合与实践:
问题情境:数学活动课上,老师让同学们拿出大小两副三角板,按照如图1所示的方式摆放.其中
,
,
.
问题探究:将三角板
绕点B按顺时针方向旋转.
(1)如图2,当点E落在边
上时,延长
交
于点F,试判断
与
的数量关系,并说明理由;
(2)在图2中,连接
,请求出
的长度;
(3)如图3,G为
的中点,则在旋转过程中,点G到直线
的距离的最大值是______.
问题情境:数学活动课上,老师让同学们拿出大小两副三角板,按照如图1所示的方式摆放.其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74db1f028c135803c5f56852ec330d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b851659bf075193b525317cf21659d2.png)
问题探究:将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab8a10e675354fa0c6e7da3d06b999d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/1/04ffab1a-8b79-40be-83ab-78ce5f50ddb7.png?resizew=596)
(1)如图2,当点E落在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)在图2中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(3)如图3,G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】在平面直角坐标系
中的两个图形
与
,给出如下定义:
为图形
上任意一点,
为图形
上任意一点,如果
两点间的距离有最小值,那么称这个最小值为图形
间的“和睦距离”,记作
,若图形
有公共点,则
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/29898c55-c1de-4826-87c3-513c6392a1b4.png?resizew=393)
(1)如图(1),
,
,⊙
的半径为2,则
,
;
(2)如图(2),已知
的一边
在
轴上,
在
上,且
,
,
.
①
是
内一点,若
、
分别且⊙
于E、F,且
,判断
与⊙
的位置关系,并求出
点的坐标;
②若以
为半径,①中的
为圆心的⊙
,有
,
,直接写出
的取值范围 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d7224242ab75080dfb394a39ebf7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2600016cf8b60bfba567d03e232f8a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/29898c55-c1de-4826-87c3-513c6392a1b4.png?resizew=393)
(1)如图(1),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7089a4e568ed92b1230af589f4d47be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10f13ea6b9aaa912454c630dae4dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db89258e710a5590b5c15c3ead70e4e3.png)
(2)如图(2),已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9b147ff2ec4a961c12a97448dbb90c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11407f306520ec1206f3cb5b9648f937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e84ddeb8dc1680e53fcf0ecf77cde3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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【推荐1】如图,已知抛物线
与x轴交于
,
两点,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/5ffb81fd-d572-4009-961a-3c9bad4a37b2.png?resizew=282)
(1)求抛物线的解析式;
(2)如图,若点
,连接
,将
绕平面内的某点(记为Q)逆时针旋转180°得到
,O、A、K的对应点分别为
、
、
;
①写出线段
与线段
的关系:_______.
②若点
、
两点恰好落在抛物线上,求旋转中心点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/5ffb81fd-d572-4009-961a-3c9bad4a37b2.png?resizew=282)
(1)求抛物线的解析式;
(2)如图,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4db72f9d1fde72b4cefad824267c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0294602f5bb78c063c54a308af556a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0058ea128bb9162df42cdb84d7fc9ada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5252c0e7f660497812ced6f0fe081ff.png)
①写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48e33eaa40d01f976230d4b73ae91dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5252c0e7f660497812ced6f0fe081ff.png)
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名校
【推荐2】在平面直角坐标系xOy中,二次函数
的图象过A(-1,-2)、B(1,0)两点.
![](https://img.xkw.com/dksih/QBM/2013/4/1/1573629169377280/1573629222305792/STEM/4fcfd9a5-2926-45cd-9ad6-b9a311d48687.png?resizew=341)
(1)求此二次函数的解析式;
(2)点
是x轴上的一个动点,过点P作x轴的垂线交直线AB于点M,交二次函数的图象于点N.当点M位于点N的上方时,直接写出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d779f12cd0c13aa9c899019d462f6.png)
![](https://img.xkw.com/dksih/QBM/2013/4/1/1573629169377280/1573629222305792/STEM/4fcfd9a5-2926-45cd-9ad6-b9a311d48687.png?resizew=341)
(1)求此二次函数的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1177b9aa8e43baf572b7bf5fedbbf4.png)
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