如图,抛物线y=﹣
x2+bx+c与x轴交于A(﹣3,0),B两点(A在B的左侧),与y轴交于点C(0,9),点D在y轴正半轴上,OD=4,点P是线段OB上的一点,过点B作BE⊥DP,BE交DP的延长线于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/23e2901c-6013-4ca2-ba3c-f775cd8ccdc0.png?resizew=243)
(1)求抛物线解析式;
(2)若
=
,求点P的坐标;
(3)点F为第一象限抛物线上一点,在(2)的条件下,当∠FPD=∠DPO时,求点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/23e2901c-6013-4ca2-ba3c-f775cd8ccdc0.png?resizew=243)
(1)求抛物线解析式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119847c4e5c7feccf23b59fe5c4808d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
(3)点F为第一象限抛物线上一点,在(2)的条件下,当∠FPD=∠DPO时,求点F的坐标.
更新时间:2022-07-07 10:08:58
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【推荐1】如图,在平面直角坐标系中,已知抛物线
与
轴交于
、
两点,与y轴交于点C,其顶点为点D,点E的坐标为
,该抛物线与BE交于另一点F,连接BC.
(1)求该抛物线的解析式;
(2)若点
在BC上,连接FH,求
的面积;
(3)一动点M从点D出发,以每秒1个单位的速度沿平行于
轴方向向上运动,连接OM,BM,设运动时间为t秒
,在点M的运动过程中,当t为何值时,
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228c948452192bb5b78a64ea9086b67b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953bfeb398bab2b2ba61b3e6bf0a22e.png)
(1)求该抛物线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790a5d1533bfa644fa4d259d35a1d941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfd1a2df5ba4cc5463a33a776714bff.png)
(3)一动点M从点D出发,以每秒1个单位的速度沿平行于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363df9127fb019f87ec53470c50dcc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82629fa933c0faa013af0bfdef77b2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/994f0b0a-a3f7-4803-a723-08f06cddbc43.png?resizew=194)
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【推荐2】如图,抛物线
经过x轴上的点
和点B及y轴上的点C,经过B、C两点的直线为
.
(2)点P从A出发,在线段
上以每秒1个单位的速度向B运动,同时点E从B出发,在线段
上以每秒2个单位的速度向C运动.当其中一个点到达终点时,另一点也停止运动.设运动时间为t秒,求t为何值时,
的面积最大并求出最大值.
(3)过点A作
于点M,过抛物线上一动点N(不与点B、C重合)作直线
的平行线交直线
于点Q.若点A,M,N,Q为顶点的四边形是平行四边形,求点N的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db553e64a70d3bfe4d71035ded6bd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4ecce8c9dde0d2136c1ec593479e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e80c699eabb025fb94e1830822ca9b.png)
(2)点P从A出发,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6accdd9b317c922d335e44911df357.png)
(3)过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed46a014ece6a0830c7c8b8deb2c56e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐3】如图,已知直线y=x+3与x轴交于点A,与y轴交于点B,抛物线
+bx+c经过A、B两点,与x轴交于另一个点C,对称轴与直线AB交于点E,抛物线顶点为D
(1)点A的坐标为 ,点B的坐标为 .
(2)①求抛物线的解析式;
②直线AB与抛物线的对称轴交于点E,在x轴上是否存在点M,使得ME+MB最小,求出点M的坐标;
(3)点P从点D出发,沿对称轴向下以每秒1个单位长度的速度匀速运动,设运动的时间为t秒,当t为何值时,以P、B、C为顶点的三角形是等腰三角形?直接写出所有符合条件的t值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57e815c01a412466a6aa12d3e883a77.png)
(1)点A的坐标为 ,点B的坐标为 .
(2)①求抛物线的解析式;
②直线AB与抛物线的对称轴交于点E,在x轴上是否存在点M,使得ME+MB最小,求出点M的坐标;
(3)点P从点D出发,沿对称轴向下以每秒1个单位长度的速度匀速运动,设运动的时间为t秒,当t为何值时,以P、B、C为顶点的三角形是等腰三角形?直接写出所有符合条件的t值.
![](https://img.xkw.com/dksih/QBM/2021/11/1/2841842948497408/2842711023222784/STEM/1dd9ae086e0340138644b9092c6f494f.png?resizew=461)
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【推荐1】【基础巩固】(1)如图1,在矩形
中,
,
,点E是
上的一点,连结
,若
,则
的值为______;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/23ccc3ab-5e09-4b17-a209-9996b06de679.png?resizew=172)
【类比探究】(2)如图2,在四边形
中,
,
,
,
,点E为
上一点,连结
,过点C作
的垂线交
的延长线于点G,交
的延长线于点F.求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/6b1fed61-a48b-4203-88a7-8ba9c238446a.png?resizew=180)
【拓展延伸】(3)如图3,在
中,
,
,
,将
沿
翻折得
,点E,F分别在边
上,连结
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fe1363ef62726e068550cf6b145596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/23ccc3ab-5e09-4b17-a209-9996b06de679.png?resizew=172)
【类比探究】(2)如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae8221601c7bd5c51fd520615581fa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/6b1fed61-a48b-4203-88a7-8ba9c238446a.png?resizew=180)
【拓展延伸】(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16834582e86f9c1030a4a4b316fab909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137717f0e360e82319ced7e3a6c69b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cc3c5593dee883a54618c948ca8807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/daa87ca3-c682-4351-aea1-d3ea16f52ba6.png?resizew=199)
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【推荐2】如图,平面直角坐标系中,抛物线
与
轴交于
两点,与
轴交于点
;
(1)如图1,求
的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/5c67359a-2a5a-45a2-8453-35e122e01b73.png?resizew=160)
(2)如图2,点
为第一象限抛物线上一点,连接
,取
上一点
,以
为底向下作等腰
,设
点横坐标为
,试用含
的代数式表示
的值为______(直接填空).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/6d74750d-dbef-447c-ac77-08c4d758f656.png?resizew=161)
(3)如图3,在(2)的条件下,点
为第一象限抛物线上一点,连接
交
于点
,连接
、
且
,连接并延长
与
交于点
,当
时,求
点横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2875fc5336687cace637065d1d97fef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/5c67359a-2a5a-45a2-8453-35e122e01b73.png?resizew=160)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f256890e67cbee0e1ee5e4b28ff6b2e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1a0bd1717387bf0aecdfadef215528.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/6d74750d-dbef-447c-ac77-08c4d758f656.png?resizew=161)
(3)如图3,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed0af56688be1b9033e7257ca87e44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7682506ed6fd3437073da215ece582e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59faf75f0c95312e556ae905b3ff5b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6002e96df3ccacb67a4ed8979f92d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/610adef0-c0d2-4637-9076-b5724408d07b.png?resizew=203)
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【推荐1】如图,已知抛物线
与
轴交于点
(点
在点
的左侧),与
轴交于
.
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591467237376/2466214956687360/STEM/bba339555a1740339fcf45958dee4c9d.png?resizew=226)
求点
的坐标;
若点
是抛物线在第二象限部分上的一动点,其横坐标为
求
为何值时,图中阴影部分面积最小,并写出此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a707e2d3361739d358880e76443167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.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://img.xkw.com/dksih/QBM/2020/5/18/2465591467237376/2466214956687360/STEM/bba339555a1740339fcf45958dee4c9d.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9fbbd9c88736e500f5251f97b08452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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真题
【推荐2】在平面直角坐标系
中,规定:抛物线
的伴随直线为
.例如:抛物线
的伴随直线为
,即![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/1f03623605f1400ea7086a7b53cf0df0.png)
(1)在上面规定下,抛物线
的顶点为 .伴随直线为 ;抛物线
与其伴随直线的交点坐标为 和 ;
(2)如图,顶点在第一象限的抛物线
与其伴随直线相交于点
(点
在点
的右侧)与
轴交于点![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/ed592a0ea9cd4ab5b1e318c78cc80232.png)
①若
求
的值;
②如果点
是直线
上方抛物线的一个动点,
的面积记为
,当
取得最大值
时,求
的值.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/7ede21d9ad9941e9ac88f2c27b2aef46.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/e60a022cff874e6ab2101e8a8f5aa40c.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/3f28a932983444419315a69011410bb9.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/41310e8e547d4eeea9acc871dd8a1159.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/b46ebeb4c25649cbbcbe69e30c194ec4.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/1f03623605f1400ea7086a7b53cf0df0.png)
(1)在上面规定下,抛物线
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/462f57690bc8483b8d2913bc12155119.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/462f57690bc8483b8d2913bc12155119.png)
(2)如图,顶点在第一象限的抛物线
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/dfd44ecd2c094319868e373edb9b812d.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/e1199b9452a6454fb631f1c0411678d1.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/40d8b0b7cc854017ab6dedec4395e04f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/aa23c90404d949988b504debaecd1d27.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/170d7d534b4c42a2a64b3752d5442447.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/ed592a0ea9cd4ab5b1e318c78cc80232.png)
①若
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/95e7195a22134418aab14c9b3509f3e5.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/8d8d920f68924ab09643aa6a1bf954e1.png)
②如果点
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/9b9e49f9cac34fcda2cad729df5ea1c3.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/18b9544670f240d0944b8f4e84e3bda4.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/17bde2cadf3b4b3daa32af5865d831c0.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/12343fcca0964785b15afd2eda8749cc.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/12343fcca0964785b15afd2eda8749cc.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/e20fa29c29384c62a2d8518152991e15.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/8d8d920f68924ab09643aa6a1bf954e1.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762042036224/1773762042421248/STEM/d00d526fef1a455aad1cf59ed1d7adb5.png)
您最近一年使用:0次
【推荐3】综合与探究
如图1,在平面直角坐标系中,抛物线
与
轴交于
两点(点
在点
的左侧),与
轴交于点
,
是
轴负半轴上一点,
,直线
与抛物线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/21d7047a-3ccc-45d9-a865-29374b02263f.png?resizew=537)
(1)求直线
的函数表达式.
(2)如图2,在线段
上有一条2个单位长度的动线段
(点
在点
的左侧),过点
作
轴的垂线,交抛物线于点
,交直线
于点
;过点
作
轴的垂线,交抛物线于点
,交直线
于点
,连接
,
.设点
的横坐标为
,请解答下列问题:
①线段
的长为______;(用含
的代数式表示)
②当
时,判断四边形
的形状,并说明理由;
③求当
为何值时,
.
(3)如图3,当点
在抛物线的对称轴上时,连接
.试探究:此时在第一象限内是否存在点
,使以
,
,
为顶点的三角形与
相似?若存在,请直接写出点
的坐标;若不存在,请说明理由.
如图1,在平面直角坐标系中,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3882b16f9ad3999cf54dcb7708b9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c223712c9e19b504abe4444e739c4369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/21d7047a-3ccc-45d9-a865-29374b02263f.png?resizew=537)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54078c4af5b305e26b8e3faa6423e67e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb54c51338a3eaa4078b6c20124264e6.png)
③求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d72d238110b140310d475674adf2515.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
您最近一年使用:0次