如图,在平面直角坐标系中,抛物线
与直线AB交于点
,
.
(2)点P是直线
下方抛物线上的一动点,过点P作x轴的平行线交
于点C,过点P作y轴的平行线交x轴于点D,求
的最大值及此时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e71e5556367a7ded46fcdcaf2eee5bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69fff64ee6ea236550185efc7ed1b598.png)
(2)点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186dee1a1cf68677d143172a2a50709c.png)
更新时间:2024-04-06 17:39:34
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【推荐1】如图,在平面直角坐标系中,过点P(﹣
,
)的抛物线
.分别交x轴于A,B两点(点A在点B的左侧)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/bc2ee08e-2b9a-4901-8733-7d1c61f5ec13.png?resizew=167)
(1)求抛物线的函数表达式;
(2)若点Q是抛物线对称轴上一点,当
取得最小值时,求点Q的坐标;
(3)当M(m,0),N(0,n)两点满足:
,
,且
时,若符合条件的M点的个数有2个,直接写出n的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a810acf95bbbcc72d30d2bd65f6aea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c810e380d96855615fdd91d29977a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/bc2ee08e-2b9a-4901-8733-7d1c61f5ec13.png?resizew=167)
(1)求抛物线的函数表达式;
(2)若点Q是抛物线对称轴上一点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8238c258052766317280624aa8d3795.png)
(3)当M(m,0),N(0,n)两点满足:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e66f4eb7cec52bfa2326a1fae2ae00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be617f176ae9b359a2dc9cf848e19ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17d74d4486a02bec29f7f559e837661.png)
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解题方法
【推荐2】已知抛物线:y=x2+bx+c
(1)若抛物线过点(2,﹣3),(4,5),求b、c.
(2)若抛物线过(﹣1,m2﹣m),(2,m2+2m),且﹣5≤m≤﹣3,求在m的变化过程中,抛物线最低点的坐标.
(3)直线y=2x+n与抛物线y=x2+bx+c交于A(﹣5,yA),B(﹣3,yB),把y=x2+bx+c向右平移t个单位(t>0)后交直线y=2x+n于C、D两点,若CD=2AB,求t的值.
(1)若抛物线过点(2,﹣3),(4,5),求b、c.
(2)若抛物线过(﹣1,m2﹣m),(2,m2+2m),且﹣5≤m≤﹣3,求在m的变化过程中,抛物线最低点的坐标.
(3)直线y=2x+n与抛物线y=x2+bx+c交于A(﹣5,yA),B(﹣3,yB),把y=x2+bx+c向右平移t个单位(t>0)后交直线y=2x+n于C、D两点,若CD=2AB,求t的值.
![](https://img.xkw.com/dksih/QBM/2020/5/16/2463747705479168/2463854069088256/STEM/e6327945bece48d38df76e70d5e2dd7c.png?resizew=290)
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【推荐1】如图,抛物线
与
轴交于
两点,与
轴交于点
.
(1)直接写出抛物线的解析式,并求点
的坐标.
(2)点
为第一象限内抛物线上的一动点,作
轴于点
,交
于点
,过点
作
的垂线与抛物线的对称轴和
轴交于点
,设点
的横坐标为
.
①求
的最大值;
②连接
,若
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca97516f9b88fcba781529e7b8823e4e.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/editorImg/2023/8/2/1ef79e6d-9834-4902-b86f-56f07f84fc58.png?resizew=357)
(1)直接写出抛物线的解析式,并求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d84acd3c96e20c0ce064aac125f7fe2.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e83fd42df335c85bf92b7961b9851977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832eca288ea293748bc05e57a0dade01.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c06f5c9f75bd16c95d60b17d39c55a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】如图,已知二次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2360befae52b72f55db50833fc7103.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/5677ecc6-e9fe-4819-9624-1e691434aba9.png?resizew=186)
(1)直接写出抛物线与坐标轴的交点坐标;
(2)若抛物线的顶点为D,在y轴上是否存在一点P,使得
的周长最小?若存在,求出
的周长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2360befae52b72f55db50833fc7103.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/5677ecc6-e9fe-4819-9624-1e691434aba9.png?resizew=186)
(1)直接写出抛物线与坐标轴的交点坐标;
(2)若抛物线的顶点为D,在y轴上是否存在一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
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