已知二次函数
.
(1)若二次函数的图象经过点
,求
的值;
(2)在(1)的条件下,当
时,二次函数的最大值是6,求
的值;
(3)已知点
,
,直线
与
轴和
轴分别交于点
,
,若
与直线
有两个不同的交点.其中一个交点在线段
上(包含
,
两个端点).另一个交点在线段
上(包含
,
两个端点),直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2707db73fc05ef04f5df58938bd83ae6.png)
(1)若二次函数的图象经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48befa5d90fafd8bfdb6c90fd241ebfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3adea93fc32cf0ba7d8a9a38b0739cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc4291b69c88f9e26cefb02a3de2b3da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e5eea5f7f98ca8632358b7e49ceb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2707db73fc05ef04f5df58938bd83ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2024-04-15 09:07:02
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【推荐1】如图,抛物线y1=﹣x2+2向右平移1个单位得到的抛物线y2,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/d6339008-7112-4a77-aaad-ae6d15560152.png?resizew=165)
(1)抛物线y2的顶点坐标是什么?
(2)阴影部分的面积S= .
(3)若再将抛物线y2沿x轴翻折得到抛物线y3,求抛物线y3的解析式.
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(1)抛物线y2的顶点坐标是什么?
(2)阴影部分的面积S= .
(3)若再将抛物线y2沿x轴翻折得到抛物线y3,求抛物线y3的解析式.
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【推荐2】如图,已知抛物线的二次项系数为1,且经过点
和
,请回答下列问题:
(1)求抛物线的解析式;
(2)若抛物线与
轴交于点A、
,与
轴交于点
,连接
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095dc650c8838419f5381e3fe0135b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d642138424be9ab9eef3c35172898589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/5/918f76df-9713-4479-8128-642a68c9d9ff.png?resizew=148)
(1)求抛物线的解析式;
(2)若抛物线与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐3】如图1是一座抛物线型拱桥,图2是其在直角坐标系中的侧面示意图.在正常水位时水面宽
,此时水面离桥拱顶部的距离为
.
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967074982813696/2970895964340224/STEM/70727de3-2034-438e-9ebc-3697d46a82e8.png?resizew=836)
(1)按如图2所示的直角坐标系,求此抛物线的函数表达式;
(2)如图3,因某种需要,在桥拱顶部及桥的两端树立了三根支柱
,
,
架设钢缆,在钢缆和桥面之间竖直悬挂若干安全绳,过相邻支柱顶端的钢缆具有相同的抛物线形状,且左、右两条抛物线关于
轴对称,左面钢缆抛物线可以用
表示.
①求左、右面两条钢缆的最低点之间的距离是多少?
②求安全绳长度(钢缆和桥面之间距离)的最小值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba872e72aaf7d05254361e7e128093b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d568856b3349a45f8b95d4a6454a858.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2967074982813696/2970895964340224/STEM/70727de3-2034-438e-9ebc-3697d46a82e8.png?resizew=836)
(1)按如图2所示的直角坐标系,求此抛物线的函数表达式;
(2)如图3,因某种需要,在桥拱顶部及桥的两端树立了三根支柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15237e8cc227439a103ba09339d7d7fa.png)
①求左、右面两条钢缆的最低点之间的距离是多少?
②求安全绳长度(钢缆和桥面之间距离)的最小值是多少?
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【推荐1】平面直角坐标系中,抛物线
与x轴有两个交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/e9f79194-150d-4bca-8cdd-b03f0f7a241d.png?resizew=161)
(1)求抛物线的对称轴(用含有m的式子表示):
(2)过点
作直线
轴,抛物线的顶点A在直线l与x 轴之间(不包含点A在直线l上),求m的范围:
(3)在(2)的条件下,设抛物线的对称轴与直线l相交于点B.结合图象,求
的面积最大时m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a0bc01669f120150f0cca25c0950b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/e9f79194-150d-4bca-8cdd-b03f0f7a241d.png?resizew=161)
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(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89aa5179e3c8cfe94026601d9bf6bb07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed78ea04659678011a0e4564cb781a3.png)
(3)在(2)的条件下,设抛物线的对称轴与直线l相交于点B.结合图象,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
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【推荐2】已知二次函数
的图象经过点
,
.点
在抛物线
上,其横坐标为
.
(1)求抛物线的解析式;
(2)当
时,求
的取值范围;
(3)当抛物线
上
、
两点之间部分的最大值与最小值的差为
时,求
的值;
(4)点
在抛物线
上,其横坐标为
.过点
作
轴于点
,过点
作
轴于点
,分别连接
,
,
,当
与
的面积相等时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753e1797acdf8e73b7a46e8e6027f2cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)求抛物线的解析式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b13d3854ea2671a9ae5be5b69a573e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(3)当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28144f4eee678c7f2688b21261149d1.png)
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【推荐1】如图,抛物线
与x轴交于点
、点
,与y轴交于点
.
(1)求抛物线的表达式及顶点坐标;
(2)将该抛物线向下平移,使得新抛物线的顶点落在x轴上,原抛物线上一点P平移后的对应点为点Q,如果
,求点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7706e60c7eb1d50efa10c291d7b936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a57a170489b8ccdbf2886a08ccde4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/922d53ce802eeed79fd08e1b1f10e298.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/91bbb494-412f-4b39-bb8c-8e3f3a27a646.png?resizew=158)
(1)求抛物线的表达式及顶点坐标;
(2)将该抛物线向下平移,使得新抛物线的顶点落在x轴上,原抛物线上一点P平移后的对应点为点Q,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731016f5081dca7e5726598d757c0449.png)
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【推荐2】如图,已知
的半径为1,圆心
在抛物线
上运动,当
与
轴相切时,求圆心
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae4a4e7da830965c273a7836429bbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/187cc7d2-852a-44c8-891a-5d3e25a40129.png?resizew=158)
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