在平面直角坐标系中,
,
.
、
两点,且与
轴交于点
,求此抛物线的顶点坐标;
(2)如图,小敏发现所有过
、
两点的抛物线如果与
轴负半轴交于点
,
为抛物线的顶点,那么
与
的面积比不变,请你求出这个比值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7597c6e4b7c7215651b1ef03bf2c1e11.png)
(2)如图,小敏发现所有过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddb32a7a5c157fdf8aa049b2d665b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
2024九年级下·云南·专题练习 查看更多[1]
(已下线)专题10 二次函数与几何问题(一)(六大热点题型归纳)-2024年中考数学二轮热点题型归纳与变式演练(云南专用)
更新时间:2024-05-14 11:24:21
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相似题推荐
解答题-问答题
|
适中
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名校
【推荐1】如图,在平面直角坐标系中,抛物线
、
为常数.且
经过点
,交
轴于点
、
在
的左侧),其顶点的横坐标为2.
的函数表达式;
(2)将抛物线
向左平移2个单位长度后得到抛物线
,
为抛物线
上的动点,点
为抛物线
的对称轴上的动点,请问是否存在以
、
、
、
为顶点且以
为边的四边形是平行四边形?若存在,求出
点坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5150ac42d85ecdbba37444319e1846b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28b08682efa2692b052f64fe1448fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44096ab5229ea194599193e6ae217297.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/bd540d7a71be9612f39178ac6fd37184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
(2)将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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解答题-作图题
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【推荐2】已知二次函数
的图象经过点
,点
.
(1)求该二次函数的解析式并在平面直角坐标系
中画出该函数的图象;
(2)当
时,对于
的每一个值,函数
的值都大于函数
的值且不大于5,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f0be749c2abcfcf8795651ff315354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaef66a0582e95fb5c57a405acdea9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad20e2bc6576fc461419f8f138d26e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/cf9f16d6-444e-4ab5-8e74-77495276d7fb.png?resizew=176)
(1)求该二次函数的解析式并在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1dbe0d4a121e1b69c2ad3b14d25d1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d83a2fa5ca1b089f644ff00d4a3a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f0be749c2abcfcf8795651ff315354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】如图,题目中的黑色部分是被墨水污染了无法辨认的文字,导致题目缺少一个条件而无法解答,经查询结果发现,该二次函数的解析式为
.
(1)请根据已有信息添加一个适当的条件: ;
(2)当函数值
时,自变量
的取值范围: ;
(3)如图1,将函数
的图象向右平移
个单位长度,与
的图象组成一个新的函数图象,记为
.若点
在
上,求
的值;
(4)如图2,在(3)的条件下,点
的坐标为
,在
上是否存在点
,使得
若存在,求出所有满足条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12bd6a8ebe4b708851dec94d70fdcfb5.png)
已知二次函数![]() ![]() ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/7/b3476e66-d477-46aa-a574-3ee5018ecb95.png?resizew=363)
(1)请根据已有信息添加一个适当的条件: ;
(2)当函数值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be234a0bace36012018d684f4c4de4f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)如图1,将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d95c4d9e65d99a8a3028962085044e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431b84df525d5820947812ead1ef88e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00fedc538e037135e1d5ef9a24e9da11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)如图2,在(3)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548b6691d47cc112eabe306ee3881a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e2d957de1696575647d29b9a0dc303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】已知二次函数
经过点
、
,与x轴交于另一点B,抛物线的顶点为D.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/5a2e501a-7616-4724-a213-3e550ea36036.png?resizew=211)
(1)求此二次函数解析式;
(2)连接
、
、
,判断
的形状并说明理由;
(3)在对称轴右侧抛物线上找一点P,使得P、D、C构成以
为底边的等腰三角形,求出点P的坐标及此时四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3932d1d2c7c4b81ae923fcf5d3f74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850e01debd266a398b597a1876dbb3ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/5a2e501a-7616-4724-a213-3e550ea36036.png?resizew=211)
(1)求此二次函数解析式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
(3)在对称轴右侧抛物线上找一点P,使得P、D、C构成以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4864c21e9664fa9111ede6425b09563a.png)
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