如图,二次函数y=﹣x2+bx+c与x轴交于点B和点A(﹣1,0),与y轴交于点C(0,4),与一次函数y=x+a交于点A和点D.
(1)求出a、b、c的值;
(2)若直线AD上方的抛物线存在点E,可使得△EAD面积最大,求点E的坐标;
(3)点F为线段AD上的一个动点,点F到(2)中的点E的距离与到y轴的距离之和记为d,求d的最小值及此时点F的坐标.
(1)求出a、b、c的值;
(2)若直线AD上方的抛物线存在点E,可使得△EAD面积最大,求点E的坐标;
(3)点F为线段AD上的一个动点,点F到(2)中的点E的距离与到y轴的距离之和记为d,求d的最小值及此时点F的坐标.
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865078690922496/2870972440494080/STEM/ae2c1467-018d-44d1-8930-0519c9e9139d.png?resizew=215)
21-22九年级上·浙江杭州·期中 查看更多[5]
浙江省杭州市天杭实验学校2021-2022学年九年级上学期期中数学试题(已下线)重难点05 二次函数中面积问题-2022-2023学年九年级数学考试满分全攻略(浙教版)(已下线)专题07 二次函数中面积最值-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(浙教版)(已下线)期中难点特训(二)与二次函数有关的压轴题-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(浙教版)河南省新乡市红旗区第一中学2021-2022学年九年级上学期期末数学试题
更新时间:2021-12-12 15:51:17
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解答题-问答题
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适中
(0.65)
【推荐1】已知:直线
与
轴、
轴分别相交于点A和点
,点
在线段
上,将
沿
折叠后,点
恰好落在
边上点
处.
![](https://img.xkw.com/dksih/QBM/2022/10/4/3080285825277952/3081729780482048/STEM/0e20c561c6fd4fe59f3fccc76735b7f9.png?resizew=214)
(1)求A点的坐标 和
点的坐标 ;
(2)求
的长?
(3)求出
的长?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8648fb5353d892f0504ca5302a19d132.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abac49af241cc15c7834cd9627142627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2022/10/4/3080285825277952/3081729780482048/STEM/0e20c561c6fd4fe59f3fccc76735b7f9.png?resizew=214)
(1)求A点的坐标 和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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适中
(0.65)
【推荐2】如图,一次函数
的图象与反比例函数
的图象交于
、
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/5a0b1cb6-eb22-4482-9f6e-aa303ad6b9cb.png?resizew=141)
(1)求
,
的值;
(2)请直接写出不等式
的解集;
(3)将x轴下方的图像沿x轴翻折,点A落在点
处,连接
、
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501a6d50c937729c8d0f02b2b62a0ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb79a1b0c6dc78e6de17de6bed477fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93a6ed08f349b4de10d1ccb6dfbeae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d4822ff6fee1932a1bc2fbec3204ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd58e0ef16b55fcf127f020b4ea2800.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/5a0b1cb6-eb22-4482-9f6e-aa303ad6b9cb.png?resizew=141)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)请直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/261e9b849f2ec0f7ce813c33baec413f.png)
(3)将x轴下方的图像沿x轴翻折,点A落在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7856b843caf384fca612ce663f21c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
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适中
(0.65)
【推荐1】如图, 在Rt
中,
, 经过
三点作
的角平分线
交
于点
, 交
于点
, 连结
.
![](https://img.xkw.com/dksih/QBM/2022/1/22/2899686552510464/2900733645185024/STEM/28241f8d-6483-46eb-993e-763fac582bb1.png?resizew=546)
(1)求证:
;
(2)当
时, 求线段
的长;
(3)当
时, 设
, 求
关于
的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
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(1)求证:
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(2)当
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(3)当
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解答题-证明题
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【推荐2】如图,已知正方形
,P是对角线
上任意一点,过点P作
于点M,
于点N.
是正方形;
(2)若E是
上一点,且
,写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a903cbf12228062fac13c323a22a1fb.png)
(2)若E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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解答题-问答题
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适中
(0.65)
【推荐1】综合与探究:如图,在平面直角坐标系
中,抛物线
的顶点为点D,与x轴交于点A和点B,其中B的坐标为
.直线l与抛物线交于B,C两点,其中点C的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/e6686482-f0d1-4bd9-a69d-58be91377c9b.png?resizew=204)
(1)求抛物线和直线l的解析式;
(2)直线l与抛物线的对称轴交于点E,P为线段
上一动点(点P不与点B,C重合),过点P作
交抛物线于点F,设点P的横坐标为t.当t为何值时,四边形
是平行四边形?
(3)在(2)的条件下,设
的面积为S,当t为何值时,S最大?最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/e6686482-f0d1-4bd9-a69d-58be91377c9b.png?resizew=204)
(1)求抛物线和直线l的解析式;
(2)直线l与抛物线的对称轴交于点E,P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(3)在(2)的条件下,设
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【推荐2】如图,二次函数
的图象与x轴交于O(O为原点),A两点,已知二次函数图象经过点
,且其对称轴为直线
.
(2)已知y轴上一点
,点P是二次函数图象上位于x轴下方的一点,连接
.设点P的横坐标为t,
的面积为S.
①求S与t之间的函数表达式(不要求写自变量的取值范围);
②当S取最大值时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1d51b51786a763f5f7709600dd4512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
(2)已知y轴上一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d429efe96d68065e7d433c996682791d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e72153d484326affcc81c56a24761a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
①求S与t之间的函数表达式(不要求写自变量的取值范围);
②当S取最大值时,求点P的坐标.
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