如图所示,已知在平面直角坐标系
中,抛物线
(其中
、
为常数,且
)与
轴交于点
,它的坐标是
,与
轴交于点
,此抛物线顶点
到
轴的距离为4.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/7ef33517-29fa-4fde-a574-6f3ebe47a00d.png?resizew=170)
(1)求抛物线的表达式;
(2)求
的正切值;
(3)如果点
是抛物线上的一点,且
,试直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9b0fcaa6deb9bac941a4366c44f7ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.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/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/7ef33517-29fa-4fde-a574-6f3ebe47a00d.png?resizew=170)
(1)求抛物线的表达式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
(3)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd6310f16a4c7af5b52f123ea64ec16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
20-21九年级上·全国·期末 查看更多[1]
更新时间:2020-02-04 12:11:42
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解答题-问答题
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较难
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【推荐1】如图,在直角坐标系x O y中,二次函数
的图像与x轴、y轴的公共点分别为A(5,0)、B,点C在这个二次函数的图像上,且横坐标为3.
![](https://img.xkw.com/dksih/QBM/2013/5/30/1573658371637248/1573658377183232/STEM/1a346086a7e74e62a81b8461b01e2a27.png)
(1)求这个二次函数的解析式;
(2)求∠BAC的正切值;
(3)如果点D在这个二次函数的图像上,且∠DAC = 45°,求点D的坐标.
![](https://img.xkw.com/dksih/QBM/2013/5/30/1573658371637248/1573658377183232/STEM/357e16bfa1de4103a7bea2d486919059.png)
![](https://img.xkw.com/dksih/QBM/2013/5/30/1573658371637248/1573658377183232/STEM/1a346086a7e74e62a81b8461b01e2a27.png)
(1)求这个二次函数的解析式;
(2)求∠BAC的正切值;
(3)如果点D在这个二次函数的图像上,且∠DAC = 45°,求点D的坐标.
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【推荐2】在平面直角坐标系
中,抛物线
经过点
,顶点为点B,对称轴为直线
,且对称轴与x轴交于点C.直线
,经过点A,与线段
交于点E.
(1)求抛物线
的表达式;
(2)联结
、
.当
的面积为3时,求直线
的表达式;
(3)在(2)的条件下,设点D为y轴上的一点,联结
、
,当
时,求
的余切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71acf35bb0952c2abba601707d000c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c905c723e30f28088fd7f7dc09ef1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71acf35bb0952c2abba601707d000c0.png)
(2)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022f0dc17db5fcc83b204dc845447ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
(3)在(2)的条件下,设点D为y轴上的一点,联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8070ead81f798caf7bd4bb22ae75d008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba1315d450c8353c6611785f71546b5.png)
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真题
【推荐1】如图,抛物线y=ax2+bx﹣5(a≠0)与x轴交于点A(﹣5,0)和点B(3,0),与y轴交于点C.
(1)求该抛物线的解析式;
(2)若点E为x轴下方抛物线上的一动点,当S△ABE=S△ABC时,求点E的坐标;
(3)在(2)的条件下,抛物线上是否存在点P,使∠BAP=∠CAE?若存在,求出点P的横坐标;若不存在,请说明理由.
(1)求该抛物线的解析式;
(2)若点E为x轴下方抛物线上的一动点,当S△ABE=S△ABC时,求点E的坐标;
(3)在(2)的条件下,抛物线上是否存在点P,使∠BAP=∠CAE?若存在,求出点P的横坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/10/14/1574248515510272/1574248521900032/STEM/ff204b4979d44a6985b51eaf7ce69809.png)
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【推荐2】如图,抛物线y=ax2+bx-4a经过A(-1,0)、C(0,4)两点,与x轴交于另一点B.
![](https://img.xkw.com/dksih/QBM/2016/4/19/1578871421362176/1578871421919232/STEM/85152218c055420080d941d9023f4936.png)
(1)求抛物线的解析式;
(2)已知点D(m,m+1)在第一象限的抛物线上,求点D关于直线BC对称的点的坐标;
(3)在(2)的条件下,连接BD,点P为抛物线上一点,且∠DBP=45°,求点P的坐标.
![](https://img.xkw.com/dksih/QBM/2016/4/19/1578871421362176/1578871421919232/STEM/85152218c055420080d941d9023f4936.png)
(1)求抛物线的解析式;
(2)已知点D(m,m+1)在第一象限的抛物线上,求点D关于直线BC对称的点的坐标;
(3)在(2)的条件下,连接BD,点P为抛物线上一点,且∠DBP=45°,求点P的坐标.
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