如图,已知二次函数
的图象与x轴交于
,B,与y轴交于点
.
轴交抛物线于点D.
(1)求b,c的值.
(2)已知点E在抛物线上且位于x轴上方,过E作y轴的平行线分别交
于点F,G,且
,求点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee6f55f5de53781cc0e1c61f9fc5995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8916a93b62606c13bbb9f11e86a65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d6eb67e32034c7c7312d6442e5ef40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/26e08330-3972-4f7d-86b0-2cea7959eb77.png?resizew=252)
(1)求b,c的值.
(2)已知点E在抛物线上且位于x轴上方,过E作y轴的平行线分别交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2f80a9b93e99bc9460a1db7fa25e48.png)
更新时间:2023-06-16 10:59:45
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【推荐1】已知抛物线
经过点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/0b911468-2520-4a29-8c89-e102509ea94f.png?resizew=144)
(1)求m的值,并求出此抛物线的顶点坐标;
(2)当
时,直接写出y的取值范围 .
(3)若将此抛物线绕其顶点旋转180°,直接写出旋转后抛物线的表达式为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52387621283198eb16bea9c41fee46ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71023702837182e9ef8605d9824f7c79.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/0b911468-2520-4a29-8c89-e102509ea94f.png?resizew=144)
(1)求m的值,并求出此抛物线的顶点坐标;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ac8ebedafa300c895540c5e5dda755.png)
(3)若将此抛物线绕其顶点旋转180°,直接写出旋转后抛物线的表达式为 .
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【推荐2】如图,已知直线
过
轴上一点
且与抛物线
相交于
,
两点.
(1)求抛物线对应的函数解析式;
(2)问抛物线上是否存在一点
,使
?若存在,请求出
点坐标;若不存在,请说明理由.
![](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/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87859748d7c7d665df7d430856bae01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求抛物线对应的函数解析式;
(2)问抛物线上是否存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f9f12a414e16c4d52da5607ca0a0fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2021/1/16/2637466753441792/2638750817738752/STEM/67680a99-cd4c-4d4f-bb01-0f3c031e9903.png)
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【推荐3】如图1,一段高架桥的两墙A,
由抛物线一部分
连接,为确保安全,在抛物线一部分
内修建了一个菱形支架
,抛物线的最高点
到
的距离
米,
,点
,
在抛物线一部分
上,以
所在的直线为
轴,
所在的直线为
轴,建立平面直角坐标系
,确定一个单位长度为1米.
(2)如图2,现在将菱形
做成广告牌,且在菱形内再做一个内接矩形
广告牌,设边
长度为
米,试求内接矩形
的面积S(用含
的式子表示);
(3)若已知矩形
广告牌的价格为80元/米
,广告牌其余部分的价格为160元/米
,试求完成菱形广告牌所需的最低费用.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce8737bbbe2e8d297a76dcbce42e4a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63447ea996b9036a7a7ae726cc382cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af47c9835b719d050694b055c69dba5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf468f5132e14ee1d8cc766808b11af.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/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(2)如图2,现在将菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce8737bbbe2e8d297a76dcbce42e4a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)若已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
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【推荐1】如图,关于x的二次函数
的图象记为L,点P是L上对称轴右侧的一点,作
轴,与L在对称轴左侧交于点Q;点A,B的坐标分别为
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/7129381d-9ede-4a6b-8f17-e778024f9d82.png?resizew=285)
(1)若
,设点P,Q的横坐标分别为m,n,求n关于m的关系式;
(2)若L与线段
有公共点,求t的取值范围;
(3)当
时,y的最小值为
,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c06822e60ce26f382c0a5bf0cf3906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28144f4eee678c7f2688b21261149d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c832f2474efe89961ef41e884da7660c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/7129381d-9ede-4a6b-8f17-e778024f9d82.png?resizew=285)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
(2)若L与线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32149447b65ad0d1f2c9b3381e504da8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0129914278d2f2c8aea0643ae7a5bc.png)
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【推荐2】如图,直线y1=-x-2交x轴于点A,交y轴于点B,抛物线y2=ax2+bx+c的顶点为A,且经过点B.
(1)求该抛物线的解析式;
(2)求当y1≥y2时x的值.
(1)求该抛物线的解析式;
(2)求当y1≥y2时x的值.
![](https://img.xkw.com/dksih/QBM/2017/9/16/1779581181763584/1830702914019328/STEM/9fbce61c16654a64b4cc0137df209239.png?resizew=178)
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【推荐1】如图,二次函数y=﹣x2+bx+c的图像经过点A(﹣1,0),点B(3,0),与y轴交于点C,连接BC.
![](https://img.xkw.com/dksih/QBM/2022/1/15/2894761668911104/2896644676116480/STEM/e0aac984-ca95-47a9-a6b0-13ff56a241c8.png?resizew=224)
(1)填空:b= ,c= ;
(2)过点C作
轴,交二次函数y=﹣x2+bx+c的图像于点D,点M是二次函数y=﹣x2+bx+c图像上位于线段CD上方的一点,过点M作
轴,交线段BC于点N.设点M的横坐标为m,四边形MCND的面积为S.
①求S与m的函数表达式,并求S的最大值;
②点P为直线MN上一动点,当S取得最大值时,求△POC周长的最小值.
![](https://img.xkw.com/dksih/QBM/2022/1/15/2894761668911104/2896644676116480/STEM/e0aac984-ca95-47a9-a6b0-13ff56a241c8.png?resizew=224)
(1)填空:b= ,c= ;
(2)过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db365bec556a5d4386648db1e07a29d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20f734ac54ab0eec2e1c170a3a24f1.png)
①求S与m的函数表达式,并求S的最大值;
②点P为直线MN上一动点,当S取得最大值时,求△POC周长的最小值.
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【推荐2】已知直线
经过点
,且与抛物线
相交于B,C两点,点C的坐标为
.
![](https://img.xkw.com/dksih/QBM/2022/12/23/3136854718537728/3140800126763008/STEM/9d4b19ae7d9c4bdcaf7cdd53af535e3e.png?resizew=278)
(1)求直线和抛物线的函数解析式;
(2)在y轴上有一点P,若
,求点P坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976968bee12bcb50dea41b49fea8461c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee74bec70d68998ec523fa5812760336.png)
![](https://img.xkw.com/dksih/QBM/2022/12/23/3136854718537728/3140800126763008/STEM/9d4b19ae7d9c4bdcaf7cdd53af535e3e.png?resizew=278)
(1)求直线和抛物线的函数解析式;
(2)在y轴上有一点P,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
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