已知抛物线y=-
x2+bx+c和x轴正半轴相交于A、B两点,AB=4,P为抛物线上的一点,它的横坐标为-1,∠PAO=45°,cot∠PBO=
.
(1)求P点的坐标;
(2)求抛物线的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75096deb06fa2aeaace0ec13f59c9ef1.png)
(1)求P点的坐标;
(2)求抛物线的解析式.
18-19九年级下·山东·课后作业 查看更多[1]
(已下线)2019届九年级下学期数学教材解读(青岛版)5.5确定二次函数的表达式(同步练习)
更新时间:2019-03-05 22:21:10
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【知识点】 待定系数法求二次函数解析式解读
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【推荐1】如图,平面直角坐标系中,抛物线
交
轴于
,
,交
轴于点
.
(1)求抛物线的函数表达式;
(2)直线
与抛物线交于
两点,与直线
交于点
.若点
是线段
上的动点,过点
作
轴的垂线,交抛物线于点
,交直线
于点
,交直线
于点
.
①当
时,求
的值;
②在平面内是否存在点
,使四边形
为正方形?若存在,请求出点
的坐标,若不存在,请说明理由.
![](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/7e4e3a3a7384f89428febdd4f0d97162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf982e2547498e78cd6b95f5bcaaa62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b0c3cc887ec123499d4ea8a0870ef0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/bb1629a8-7127-4776-97cb-7dfdcc5deeae.png?resizew=369)
(1)求抛物线的函数表达式;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1542f82574c5224cc3f344733a0b563b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80934ff67b4ceeaa13b00c029db565dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897b092ac0082e02cbf8dd821a05fad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dca9c24f30374c175b3751f9825f8296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
②在平面内是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9218ace287c7c2d24528698a4fc0779d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】如图1,已知抛物线
的对称轴是直线
,且经过点
,抛物线与x轴相交于A,B两点(B点在A点右侧).
![](https://img.xkw.com/dksih/QBM/2020/12/23/2620407202324480/2623083124465664/STEM/a70cf2e0-3230-4a2e-807f-e29ac13d465b.png?resizew=678)
(1)求抛物线的解析式和A,B两点的坐标;
(2)如图2,已知
,
,
,点P是第一象限的抛物线
上的一点.
①当
时,求使四边形EFPQ的面积最大时的点P的坐标;
②若
,求m为何值时,四边形EFPQ的周长最小?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c977d0f39570f4f89be26efe20cc056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7a98a3b8efc4c726892c2a664764e9.png)
![](https://img.xkw.com/dksih/QBM/2020/12/23/2620407202324480/2623083124465664/STEM/a70cf2e0-3230-4a2e-807f-e29ac13d465b.png?resizew=678)
(1)求抛物线的解析式和A,B两点的坐标;
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451fc6e4248b63e70595f23842f06c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3544b57e2eef4630665dfd8edb69e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2f84f282c38aea5be26ed187179794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c977d0f39570f4f89be26efe20cc056.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3065bf0c45e88f3ee304fd73c441dec9.png)
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