如图,已知抛物线y=ax2+bx﹣2(a≠0)与x轴交于A、B两点,与y轴交于C点,直线BD交抛物线于点D,并且D(2,3),tan∠DBA=
.
![](https://img.xkw.com/dksih/QBM/2013/9/10/1573680959266816/1573680965722112/STEM/6d8c6676-a28d-4c1e-8f98-4ec905639319.png?resizew=185)
(1)求抛物线的解析式;
(2)已知点M为抛物线上一动点,且在第三象限,顺次连接点B、M、C、A,求四边形BMCA面积的最大值;
(3)在(2)中四边形BMCA面积最大的条件下,过点M作直线平行于y轴,在这条直线上是否存在一个以Q点为圆心,OQ为半径且与直线AC相切的圆?若存在,求出圆心Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2013/9/10/1573680959266816/1573680965722112/STEM/6d8c6676-a28d-4c1e-8f98-4ec905639319.png?resizew=185)
(1)求抛物线的解析式;
(2)已知点M为抛物线上一动点,且在第三象限,顺次连接点B、M、C、A,求四边形BMCA面积的最大值;
(3)在(2)中四边形BMCA面积最大的条件下,过点M作直线平行于y轴,在这条直线上是否存在一个以Q点为圆心,OQ为半径且与直线AC相切的圆?若存在,求出圆心Q的坐标;若不存在,请说明理由.
更新时间:2016-12-05 18:45:01
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【推荐1】如图,在平面直角坐标系中,抛物线
顶点
的坐标为
,与
平行的动直线与抛物线交于
,
两点(且点
在点
的左边),以
为斜边向右下方做等腰直角三角形,直角顶点为点
,直角边
与抛物线交于点
.
(2)当点
恰好与抛物线与
轴的交点重合时,求
的值;
(3)当直线与抛物线的交点距离
时,是否存在点
在抛物线上,点
在直线
上,使得
为等腰直角三角形?若存在,求出
的面积;若不存在,请说明理由;
(4)连接
,当
的面积被线段
分为
的两部分时,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82021e3b713f7564729c29f05fe7bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445dcfa084f3d74fcb99db53afcf828f.png)
(3)当直线与抛物线的交点距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6834ac70927ae08d7d36a1922403c9e.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐2】小刚在用描点法画抛物线
时,列出了下面的表格:
的顶点坐标:;
(2)求抛物线
的解析式;
(3)将抛物线
先向下平移3个单位长度,再向左平移4个单位长度,得到新的抛物线
若直线
与两抛物线
共有两个公共点,求b的取值范围;
(4)若
时,恰好有
直接写出直线
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9110893482c0dbc069e86e6aed9539b0.png)
x | … | 0 | 1 | 2 | 3 | 4 | … |
y | … | 3 | 6 | 7 | 6 | 3 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10392437ab60e58109787b9b0952f2d.png)
(2)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10392437ab60e58109787b9b0952f2d.png)
(3)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10392437ab60e58109787b9b0952f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547b0bb78501c927a09f0673e784c157.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87490be8d0cdb7bc6c39d1a37f3bc335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a416a50d339d2b9375f055aba69322f.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c883d61ef6f0c7642f1fd883ae4674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c17201d46d3e295641c5a24507dd3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45038f4eb0af0ec6707a966fc4c0718b.png)
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【推荐1】如图1,在平面直角坐标系中,抛物线y=﹣
x2+2
x﹣
与x轴交于A、B两点(点A在点B的左侧),与y轴交于点C,顶点为D,对称轴与x轴交于点E,直线CE交抛物线于点F(异于点C),直线CD交x轴交于点G.
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215374654455808/2217786729766912/STEM/1822ef2201ec479783c6a7a03b9f5b4b.png?resizew=487)
(1)如图1,求直线CE的解析式和顶点D的坐标;
(2)如图1,点P为直线CF上方抛物线上一点,连接PC、PF,当△PCF的面积最大时,点M是过P垂直于x轴的直线l上一点,点N是抛物线对称轴上一点,求FM+MN+NO的最小值;
(3)如图2,过点D作DI⊥DG交x轴于点I,将△GDI沿射线GB方向平移至△G′D′I′处,将△G′D′I′绕点D′逆时针旋转α(0<α<180°),当旋转到一定度数时,点G′会与点I重合,记旋转过程中的△G′D′I′为△G″D′I″,若在整个旋转过程中,直线G″I″分别交x轴和直线GD′于点K、L两点,是否存在这样的K、L,使△GKL为以∠LGK为底角的等腰三角形?若存在,求此时GL的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215374654455808/2217786729766912/STEM/1822ef2201ec479783c6a7a03b9f5b4b.png?resizew=487)
(1)如图1,求直线CE的解析式和顶点D的坐标;
(2)如图1,点P为直线CF上方抛物线上一点,连接PC、PF,当△PCF的面积最大时,点M是过P垂直于x轴的直线l上一点,点N是抛物线对称轴上一点,求FM+MN+NO的最小值;
(3)如图2,过点D作DI⊥DG交x轴于点I,将△GDI沿射线GB方向平移至△G′D′I′处,将△G′D′I′绕点D′逆时针旋转α(0<α<180°),当旋转到一定度数时,点G′会与点I重合,记旋转过程中的△G′D′I′为△G″D′I″,若在整个旋转过程中,直线G″I″分别交x轴和直线GD′于点K、L两点,是否存在这样的K、L,使△GKL为以∠LGK为底角的等腰三角形?若存在,求此时GL的长.
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名校
【推荐2】如图所示,等腰直角
中,
,点
是
延长线上一点,连接
,点
是
上一点,连接
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/f0cd2a2a-1448-46c7-bbe2-80b29585669c.jpg?resizew=460)
(1)如图1,若
,
,求
的长;
(2)如图2,过点
作
于点
,若
,试猜想
、
、
之间的关系并推理说明;
(3)如图3,在(2)的条件下,若
为射线
上一动点,
为等腰直角三角形,且
,点
为
中点,若
,
,请直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/f0cd2a2a-1448-46c7-bbe2-80b29585669c.jpg?resizew=460)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fc81089ce42da9caca24018a3ed425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad18d3f2e42fc960e17ff4bde2b2f7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396632dba26d326a6b69f0bb7016bd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc382c4f315de17f293d3d273626ade2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d2ad13daa10b63c878d595d609bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a564a13dd5ced1de486eeaafa2a326a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133760237c0ccf2d6a83786925b6d23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4509380525a4b4cea8d183de6ee3142d.png)
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【推荐1】如图,已知抛物线
交x轴于
,
两点,交y轴于点C,点P是抛物线上一点,连接AC、BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/0eb8e79c-a929-4841-b401-47e51da941ad.png?resizew=184)
(1)求抛物线的表达式;
(2)连接OP,BP,若
,求点P的坐标;
(3)在抛物线的对称轴上是否存在点Q,使得
?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90731f6d4190300b33385ce70eb2783a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/18/0eb8e79c-a929-4841-b401-47e51da941ad.png?resizew=184)
(1)求抛物线的表达式;
(2)连接OP,BP,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8341aac97aa7820d30ee61960cf9dd9.png)
(3)在抛物线的对称轴上是否存在点Q,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf9cbdb89c5da5fc02cabec31173e14.png)
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【推荐2】如图,在平面直角坐标系中,抛物线
的图像开口向上,对称轴为直线
,与x轴交于A、B两点,其中B点的坐标为(
,0),与y轴交于点C,且OB=OC,连接AC.
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943026749349888/2943740283764736/STEM/a365ca53-8c6a-4fcf-9df6-5e0071786a66.png?resizew=542)
(1)求该抛物线的解析式;
(2)如图1,P为直线AC下方抛物线上一点,过点P作PE⊥x轴交直线AC于点E,过点A作AF⊥AC交直线PE于点F,若
,求点P的坐标;
(3)如图2,点D是抛物线y的顶点,将抛物线y沿着射线AC平移得到
,
为抛物线
的顶点,过
作
⊥x轴于点M.在平移过程中,是否存在以D、
、M为顶点的三角形是等腰三角形?若存在,直接写出
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3ba0e94d4b9c1ed39b8a7e3c439b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943026749349888/2943740283764736/STEM/a365ca53-8c6a-4fcf-9df6-5e0071786a66.png?resizew=542)
(1)求该抛物线的解析式;
(2)如图1,P为直线AC下方抛物线上一点,过点P作PE⊥x轴交直线AC于点E,过点A作AF⊥AC交直线PE于点F,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382bcce0a0e8f79cf5ee4ce3f5961876.png)
(3)如图2,点D是抛物线y的顶点,将抛物线y沿着射线AC平移得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d2174f411d9db6ab7b2aea47818cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b977da2be0fc44742bd313eea1c30997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aebbfe5e1e3a23269101ae0e9b05a3fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
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【推荐3】在平面直角坐标系中,O为原点,
是等腰直角三角形,
,
,顶点
,点B在第一象限,矩形
的顶点
,点C在y轴的正半轴上,点D在第二象限,射线
经过点B.将矩形
沿x轴向右平移,得到矩形
,点O,C,D,E的对应点分别为
,
,
,
.设
,矩形
与
重叠部分的面积为S.
(1)如图①,求点B、C、D的坐标.
(2)如图②,当点
在x轴正半轴上,且矩形
与
重叠部分为四边形时,
与
相交于点F,试用含t的式子表示S.
(3)在(2)问的条件下,是否存在某一时刻t,使得矩形
与
重叠部分的面积为S与
的面积比为
?若存在,求出t的值,若不存在,请说明理由.
(4)当
时,求S的最大值(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66de81385e9afd8e180f1f156607cd01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0360abc145add7c147be3574fb682188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd4da08956db1f206c8ea026f4e52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87d89b3eb0c40885f5a6f011d9171b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f608f3cea5ef4341688db5e854f85ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87d89b3eb0c40885f5a6f011d9171b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b983d15e2265ea1fbe2e1b041b1865a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ec5b34559d44ba345133399644b485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b983d15e2265ea1fbe2e1b041b1865a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/ed8ec705-508a-4639-abdf-f963f11f644f.png?resizew=498)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/071daf6b-cb45-45dc-999f-d0bf11465498.png?resizew=493)
(1)如图①,求点B、C、D的坐标.
(2)如图②,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b983d15e2265ea1fbe2e1b041b1865a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cece895cbddf9d1f37f75e3b6346edda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(3)在(2)问的条件下,是否存在某一时刻t,使得矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b983d15e2265ea1fbe2e1b041b1865a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103ae3557903cf6dd63b931e5601ad8e.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f7c0ee5220cdc003b5ba379bb1ab47.png)
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【推荐1】如图,在平面直角坐标系
中,半径为1的圆的圆心
在坐标原点,且与两坐标轴分别交于
四点.抛物线
与
轴交于点
,与直线
交于点
,且
分别与圆
相切于点
和点
.
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573516780888064/1573516890054656/STEM/9d46608eb5874c9ba310529b6942e856.png?resizew=208)
(1)求抛物线的解析式;
(2)抛物线的对称轴交
轴于点
,连结
,并延长
交圆
于
,求
的长.
(3)过点
作圆
的切线交
的延长线于点
,判断点
是否在抛物线上,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4496fe22b40bc63581998e6b7ef6783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef733cba32a33f7fe832929c5dab9c08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573516780888064/1573516890054656/STEM/9d46608eb5874c9ba310529b6942e856.png?resizew=208)
(1)求抛物线的解析式;
(2)抛物线的对称轴交
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】抛物线
交
轴于
、
两点,交
轴于点
,已知抛物线的对称轴为
,
,
,
(1)求二次函数
的解析式;
(2)在抛物线对称轴上是否存在一点
,使点
到
、
两点距离之差最大?若存在,求出
点坐标;若不存在,请说明理由;
(3)平行于
轴的一条直线交抛物线于
两点,若以
为直径的圆恰好与
轴相切,求此圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5abc4464f8c0424a6c896617321757.png)
(1)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(2)在抛物线对称轴上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)平行于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573516092620800/1573516200222720/STEM/24d6bb890f8143f29a4ec9485013efa5.png?resizew=256)
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【推荐3】(2015梧州)如图,抛物线
与坐标轴交于A、B、C三点,其中B(4,0)、C(﹣2,0),连接AB、AC,在第一象限内的抛物线上有一动点D,过D作DE⊥x轴,垂足为E,交AB于点F.
(1)求此抛物线的解析式;
(2)在DE上作点G,使G点与D点关于F点对称,以G为圆心,GD为半径作圆,当⊙G与其中一条坐标轴相切时,求G点的横坐标;
(3)过D点作直线DH∥AC交AB于H,当△DHF的面积最大时,在抛物线和直线AB上分别取M、N两点,并使D、H、M、N四点组成平行四边形,请你直接写出符合要求的M、N两点的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
(1)求此抛物线的解析式;
(2)在DE上作点G,使G点与D点关于F点对称,以G为圆心,GD为半径作圆,当⊙G与其中一条坐标轴相切时,求G点的横坐标;
(3)过D点作直线DH∥AC交AB于H,当△DHF的面积最大时,在抛物线和直线AB上分别取M、N两点,并使D、H、M、N四点组成平行四边形,请你直接写出符合要求的M、N两点的横坐标.
![](https://img.xkw.com/dksih/QBM/2018/2/7/1877060188790784/1889321101959168/STEM/f3427d68072c40b78a8935f57fc95035.png?resizew=184)
您最近一年使用:0次