已知二次函数的图象经过点
,顶点坐标为
,求该函数的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb13bbc5335efc427f9c619a51dae3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a6fcd44ef83d4dc272d129e0578131.png)
更新时间:2023-11-07 16:08:35
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【知识点】 待定系数法求二次函数解析式解读
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】我们称顶点相同的抛物线为共顶抛物线,已知抛物线
.
(1)下列四个抛物线中,与
是共顶抛物线的是 (填序号).
①
;②
;③
;④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c96e8bbe751f6646728743bb6d9853.png)
(2)若抛物线
与
是共顶抛物线,且抛物线
经过点
,求抛物线
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ed32485d833e55fe5747812f2da782.png)
(1)下列四个抛物线中,与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd46ddadd49c798b5413b4c5f2016cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d34c1023801abd89592acf5cfa952029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fb8fd34ef13c4389958c13ee2935db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c96e8bbe751f6646728743bb6d9853.png)
(2)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0fa3da58f3254ece537344c28b949e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211b9e53e4677ae9e2b20d5f7ce0a4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605d514625a2bd879921762dd60a67b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a52e26180930ad5b56a8a45f28a0f2.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,抛物线
:
与x轴交于A,
两点,与y轴交于点
,顶点为D,抛物线
与
关于x轴对称.
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188444621275136/3192126745608192/STEM/758ea22fcfca41ea865c1e5126548b05.png?resizew=212)
(1)求抛物线
的表达式及点D的坐标;
(2)已知点E是抛物线
的顶点,点P是抛物线
上一个动点,且在对称轴右侧,过点P向对称轴作垂线,垂足为F,若以P、E、F为顶点的三角形与
相似,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d039de5bf810e3ff6b0b6096fa48d462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae140e4db2c5563e5f902fcbebaac262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://img.xkw.com/dksih/QBM/2023/3/6/3188444621275136/3192126745608192/STEM/758ea22fcfca41ea865c1e5126548b05.png?resizew=212)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
(2)已知点E是抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
您最近一年使用:0次