如图,在平面直角坐标系中,抛物线
与
轴交于
两点,与
轴交于点C,点D时抛物线的顶点
(1)求抛物线的解析式和直线
的解析式;
(2)试探究:在抛物线上是否存在点P,使得以点
为顶点,
为直角边的三角形是直角三角形,若存在,请求出,请求出符合条件的点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96dde9c4aad0536c069127df0d4b12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ab36b5a6a8376b45bb562e36fc085c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求抛物线的解析式和直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)试探究:在抛物线上是否存在点P,使得以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cd5bf007b28cde4428bb1e61ffabc8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/6f23dda6-eaa2-45b9-9962-6e9c6d5d0edb.png?resizew=193)
更新时间:2020-06-26 15:52:31
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解题方法
【推荐1】如图1,在平面直角坐标系中,O点是坐标原点,抛物线
与y轴交于点C且
,抛物线顶点D的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/12ace723-83f3-4971-ad36-888b59a7cf64.png?resizew=591)
(1)求抛物线解析式;
(2)如图2,P是抛物线上的点且在对称轴左侧,点P的横坐标为t,过点P作
轴于点A,点B在抛物线的对称轴上且在x轴上方,
,直线
交x轴于点K,若点K的横坐标为S,求S与t的函数关系式(不要求写出自变量的取值范围);
(3)如图3,在(2)的条件下,直线
与抛物线的另一个交点E在第一象限,过点E作x轴的平行线交抛物线于点F,交抛物线的对称轴于点H,连接
交直线
于点G,连接
,当
时,求点P坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/278d588d13ba2a5497cecd3720416ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dbff43582bd81f4904b71c49168d5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/12ace723-83f3-4971-ad36-888b59a7cf64.png?resizew=591)
(1)求抛物线解析式;
(2)如图2,P是抛物线上的点且在对称轴左侧,点P的横坐标为t,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9d95479904c01fe9cebbc7b3f2d6c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c48119b3932497634478f656c752ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(3)如图3,在(2)的条件下,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7321654588b66cb2063abb438aa140c0.png)
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【推荐2】如图,在平面直角坐标系中,直线
y与x轴交于点A,与y轴交于点C,抛物线
经过A,B,C三点.
![](https://img.xkw.com/dksih/QBM/2022/10/7/3082736150044672/3119463255146496/STEM/2a55a97de4ca4a50bf633193f2817cf1.png?resizew=160)
(1)求过A,B,C三点抛物线的解析式并求出顶点F的坐标;
(2)试探究在直线
上是否存在一点M,使得
的周长最小?若存在,求出M点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26039b312c374f9559870e99e47cc2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403f3db765f5bd110fce70bc4243a202.png)
![](https://img.xkw.com/dksih/QBM/2022/10/7/3082736150044672/3119463255146496/STEM/2a55a97de4ca4a50bf633193f2817cf1.png?resizew=160)
(1)求过A,B,C三点抛物线的解析式并求出顶点F的坐标;
(2)试探究在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc3907f61cec6d510a2b612a6797e6ce.png)
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【推荐1】如图1,某洒水车的喷水口
距地面
.如图2,已知喷水口喷出最远的水柱是抛物线
:
,
轴是地面,
位于
轴上,则点
,抛物线
与
轴交于点
.(注:抛物线水柱的宽度忽略)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/7b4f462a-f41a-41b5-8aec-3c1bef111ad0.png?resizew=559)
(1)求该洒水车喷水能达到的最远距离
的长;
(2)如图3,将抛物线
向左平移使其经过点
,此时抛物线
是该洒水车喷出的最近水柱,抛物线
交
轴于点
.
(ⅰ)求
的长;
(ⅱ)如图4,已知一条隔离绿化带的横截面是矩形
,
,
,设洒水车到绿化带的距离
,若该洒水车在行驶过程中能浇到完整的这条隔离绿化带,求d的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891574b7e50782ccc4f99357bafb718c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecbc6eaa4b18c45067b6c4d593db2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbeaf4e16e4bf44241833c7fb3047a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/7b4f462a-f41a-41b5-8aec-3c1bef111ad0.png?resizew=559)
(1)求该洒水车喷水能达到的最远距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(2)如图3,将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(ⅱ)如图4,已知一条隔离绿化带的横截面是矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb1f9e1781906e92c77e43c54a6de534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734ac463c26fa5caea9e4846bbe53d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0064e5578f3cba8a9a5d87d5248f6d83.png)
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【推荐2】已知抛物线的顶点为原点,且抛物线经过
.
(1)求该抛物线的表达式.
(2)已知直线
(k,t为常数)与抛物线只有一个公共点.
①求证:对于每个给定的实数t,这样的直线l均有两条;
②设①中这样的两条直线与抛物线的公共点分别为A,B问:直线
是否恒过某一定点?若是,求出定点坐标;若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b3f0ea6749231ac66795fada2a7d1f.png)
(1)求该抛物线的表达式.
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcacee2856dacc96f795bf9d12d0f35.png)
①求证:对于每个给定的实数t,这样的直线l均有两条;
②设①中这样的两条直线与抛物线的公共点分别为A,B问:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】已知抛物线
(
)与x轴交于A,B两点(点A位于点B的左侧);与y轴交于点C,顶点为D.
(1)如图1,若
,
①则D的坐标为___________;
②当
时,抛物线的最小值为3,最大值为4,则m的取值范围为___________.
(2)如图2,P是抛物线上一点,Q为射线
上一点,且P、Q两点均在第三象限内,Q、A是位于直线
同侧的不同两点,若点P到x轴的距离为d,
的面积为
.
①求证:
.
②连接
、
、
、
,若
,
,试判断
的形状是否随着n的变化而变化?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4ae30a06363123155bc1859af444f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/73be7c38-581f-4efb-a992-2fd763a67f40.png?resizew=320)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
①则D的坐标为___________;
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53652bc6995313c95f2a26d85a961258.png)
(2)如图2,P是抛物线上一点,Q为射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9cc4de98250bee5e6bd85c1c1ba17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e43b111af6a4599ed3da25ff08dfb3.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e32e41ac429ee89deb06316312a300.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e04301bff1e601717b3649fd9622cde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58133f38e2e864695098601e42684c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed4892b5b69f6fbdc4473e15fcc8c8d.png)
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【推荐2】如图,抛物线
与直线
相交于
,
两点,且与x轴交于A 、C两点.
(1)求抛物线的解析式;
(2)点P是抛物线上的一个动点(不与点A、点B重合),过点P作直线
轴于点D,交直线
于点E.
① 当
时,求P点坐标;
② 是否存在点P使
为等腰三角形?若存在请直接写出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c977d0f39570f4f89be26efe20cc056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5bb89c3ad435f1ef59307b174105ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d79c945b36a1b03f15be06caf91a798.png)
(1)求抛物线的解析式;
(2)点P是抛物线上的一个动点(不与点A、点B重合),过点P作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
① 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afcbbbe350b38381d1999e2886d45f0e.png)
② 是否存在点P使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/ca8e57a2-28e7-417a-a5d0-5ae924919129.png?resizew=184)
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