如图,二次函数
的图象经过坐标原点,与
轴交于点
.
(1)求此二次函数的解析式;
(2)在抛物线上存在一点
,且满足
,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530a9976281288e0b1e1fb2601ebf18e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/1f48c513-c30e-40ec-91f7-39fab2f58e7f.png?resizew=99)
(1)求此二次函数的解析式;
(2)在抛物线上存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2785ac883ae9b1f7e0259978d01fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
更新时间:2020-11-25 06:25:14
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【推荐1】如图,抛物线
与x轴交于A、B两点,B点坐标为
.与y轴交于点
.
(1)求抛物线的解析式;
(2)点P在x轴下方的抛物线上,过点P的直线
与直线BC交于点E,与y轴交于点F,求
的最大值;
(3)点D为抛物线对称轴上一点.当
是以BC为直角边的直角三角形时,求点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/3ed2f82d-bbe5-4b72-88fd-eb1b29c4c321.png?resizew=311)
(1)求抛物线的解析式;
(2)点P在x轴下方的抛物线上,过点P的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b88a0142cbeeed9c51167b6794e0fb.png)
(3)点D为抛物线对称轴上一点.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
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【推荐2】若凸四边形的两条对角线所夹锐角为
,我们称这样的凸四边形为“完美四边形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/b4a93407-3854-43dd-b7b9-fa8a62af2c68.png?resizew=329)
(1)在“平行四边形、梯形、菱形、正方形”中,一定不是“完美四边形”的有 ;
(2)如图1,“完美四边形”
内接于
,
与
相交于点P,且对角线
为直径,
,
,求另一条对角线
的长;
(3)如图2,平面直角坐标系中,已知“完美四边形”
的四个顶点
、
,B在第三象限,D在第一象限,
与
交于点O,直线
的解析式为
,且四边形
的面积为
,若二次函数
(a、b、c为常数,且
)的图象同时经过这四个顶点,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/b4a93407-3854-43dd-b7b9-fa8a62af2c68.png?resizew=329)
(1)在“平行四边形、梯形、菱形、正方形”中,一定不是“完美四边形”的有 ;
(2)如图1,“完美四边形”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98823cbc09ca52df1fbcc446eba3e44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图2,平面直角坐标系中,已知“完美四边形”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4e3a3a7384f89428febdd4f0d97162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72498566793449132e65e053302553f6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cc81cfaccc00aa4b7139de5a35a102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
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【推荐1】二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A、B(5,0),与y轴交于点C,抛物线的顶点为M(2,-9),连接BM,点P为线段BM上的一个动点.
(1)求二次函数的解析式.
(2)过点P作x轴的垂线,垂足为点Q,求四边形ACPQ面积的最大值.
(3)是否存在点P,使得以P、M、C为顶点的三角形是等腰三角形?若存在,求出点P的坐标;若不存在,请说明理由.
(1)求二次函数的解析式.
(2)过点P作x轴的垂线,垂足为点Q,求四边形ACPQ面积的最大值.
(3)是否存在点P,使得以P、M、C为顶点的三角形是等腰三角形?若存在,求出点P的坐标;若不存在,请说明理由.
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【推荐2】如图.已知抛物线
经过
三点,
为坐标原点
(2)若把抛物线
向下平移
个单位度,再向右平移
个单位长度得到新抛物线,若新抛物线的顶点
在
内.求
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2afe3c522e7eb8eb2d88862e7343e69.png)
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(2)若把抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920412ba07915840a5475e3c7d29894e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b829d3ded5f93007d3ba22f2a862efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐3】蔬菜大棚是一种具有出色保温性能的框架覆膜结构,它的出现使得人们可以吃到反季节蔬菜.一般蔬菜大棚使用竹结构或者钢结构的骨架,上面覆上一层或多层保温塑料膜,这样就形成了一个温室空间.如图,某个温室大棚的横截面可以看作矩形
和抛物线的一部分
构成(以下简记为“抛物线
”),其中
,
,现取
中点O,过点O作线段
的垂直平分线
交抛物线
于点E,
,若以O点为原点,
所在直线为x轴,
为y轴建立如图①所示平面直角坐标系.请结合图形解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/b78fc467-5e29-4338-a1b9-dc3f0178ae96.png?resizew=354)
(1)求抛物线的解析式;
(2)如图②,为了保证蔬菜大棚的通风性,该大棚要安装两个正方形孔的排气装置
,
,其中L,R在抛物线
上,若
,求两个正方形装置的间距
的长;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/b70d4308-b88e-44a7-a8d3-16dea7606588.png?resizew=143)
(3)如图③,在某一时刻,太阳光线透过A点恰好照射到C点,大棚截面的阴影为
,此刻,过点K的太阳光线所在的直线与抛物线
交于点P,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ddcf6bbeeaa5b4a6e8c65ca24a5d26d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e604056e427f82f7a282e8ad3d14e636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9540ee5a6df2c60af8008e7e48e64714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/b78fc467-5e29-4338-a1b9-dc3f0178ae96.png?resizew=354)
(1)求抛物线的解析式;
(2)如图②,为了保证蔬菜大棚的通风性,该大棚要安装两个正方形孔的排气装置
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1474be3f65ff7d33abdf5da0ed97a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1840e6835b43c58244cde9f70f0a0009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfaeb63d7bf0bc74876f9f23d8c3863f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/b70d4308-b88e-44a7-a8d3-16dea7606588.png?resizew=143)
(3)如图③,在某一时刻,太阳光线透过A点恰好照射到C点,大棚截面的阴影为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad8115387158c8dda205d26968ba11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65bb1c5af4c7a9376882867e07690b18.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/a5ecbe89-c710-425c-8fda-3dfc413be36d.png?resizew=323)
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