如图,直线y=
x+2与x轴,y轴分别交于点A,C,抛物线y=﹣
x2+bx+c经过A,C两点,与x轴的另一交点为B.点D是AC上方抛物线上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/0173b6ad-70cb-499d-83a5-ef9cc6b7a508.png?resizew=518)
(1)求抛物线的函数表达式;
(2)连接BC,CD,设直线BD交线段AC于点E,如图1,
,
的面积分别为S1,S2,求
的最大值;
(3)过点D作DF⊥AC于F,连接CD,如图2,是否存在点D,使得
中的某个角等于∠BAC的两倍?若存在,求点D的横坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/0173b6ad-70cb-499d-83a5-ef9cc6b7a508.png?resizew=518)
(1)求抛物线的函数表达式;
(2)连接BC,CD,设直线BD交线段AC于点E,如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
(3)过点D作DF⊥AC于F,连接CD,如图2,是否存在点D,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
17-18九年级上·浙江·期末 查看更多[15]
浙江省上杭县西南片区2018届九年级上册期末模拟数学试卷(已下线)2年中考1年模拟 第七篇 专题复习篇 专题40 存在性问题(已下线)决胜2018中考压轴题全揭秘 专题26 存在性问题(已下线)决胜2018中考压轴题全揭秘 专题12 代数综合问题江苏省如皋市外国语学校2018届九年级上学期第二次月考数学试题【市级联考】山东省潍坊市寿光市2019届九年级中考模拟数学试题2019年山东省安丘市初中学业水平二模数学试题2020年广东省深圳市南山区育才二中九年级下学期二模数学试题2020年山东省泰安市岱岳区中考数学二模试题江苏省射阳县第二初级中学2020-2021学年九年级10月月考数学(B)试题(已下线)【万唯原创】运动产生的全等、相似三角形问题·满分专练(一)(已下线)【万唯原创】2018年山西-面对面正文-第二部分拓展类型1+2福建省泉州市泉州第五中学2020年九年级上学期期中数学试题(已下线)【万唯原创】2017年山西中考数学-试题研究-第二部分题型7类型6(已下线)专题11 二次函数与角综合问题-挑战2022年中考数学压轴题之学霸秘笈大揭秘
更新时间:2020-09-21 22:24:23
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相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】在平面直角坐标系中,抛物线
分别交
轴于A、
两点,交
轴于点
,点A的坐标为
,点
的坐标为
.
(2)如图1,点
、点
分别在第一、第二象限内的抛物线上,
轴于点
,点
在第四象限内,连接
交
轴于点
,连接
、
,
且
,若点
的横坐标为
,点
的横坐标为
,
,求
与
之间的函数关系式(不要求写出自变量的取值范围);
(3)如图2,在(2)的条件下,点
在线段
上,连接
,作
平分
交线段
于点
,连接
,若
与
的度数比为
,
,求
点的纵坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c22804f52986009170586c673342d41.png)
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a175eff2a2aaaca83e0d55be4ce1ebd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3afd71f23a7622b3e99487a8c86d9379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52509a9702e993b4398a4ca74bcb4fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316056f6e656a8be4a589c78d500c86c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d0c19eec98f184ad306a1b09127b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b773bfd5555285484e48c83f6e4fa13f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4806fb7f95f63e863c287faa51f8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5dff17dd549a8c9b45b4868ef166a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
名校
【推荐2】如图,抛物线
交
轴于点
,点
在抛物线上,且
,
.
(2)点
在对称轴右侧第四象限
部分的抛物线上,连接
、
、
,设点
的横坐标为
,
的面积为
,求
与
的函数解析式;
(3)在(2)的条件下,点
为第二象限抛物线上一点,连接
交
轴于点
,过点
作
轴的平行线交射线
于点
,连接
,当
时,过点
作
轴的平行线交
于点
,点
在
上,且
,连接
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53be61cd85ec86aabd164cae0265246b.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823099d18b79aad79a43d30704291aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f693b70588a62fda394979988e94b0.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c8561afa0f1454ea382a625d000a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919ab37417f7f7378a3f01c0e79c5b2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.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/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadf37d34d06a55b0ad9b9639b073742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
解题方法
【推荐1】在平行四边形ABCD中,BC=nAB,E,F分别是边AD,DC上的点,AF⊥BE,G为垂足.
(1)当n=1时,
①如图1,若∠ABC=90°,求证:AF=BE;
②如图2,若sin∠ABC=
,E为AD的中点,求
的值.
(2)当n=
时,如图3,若∠ABC=90°,AB=2,直接写出EF的最小值.
(1)当n=1时,
①如图1,若∠ABC=90°,求证:AF=BE;
②如图2,若sin∠ABC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57799d26dbd66e5f21d327787a542e3.png)
(2)当n=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/57329ff1-fd72-44a7-bef4-68dadf98afe9.png?resizew=400)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】在平面直角坐标系中,抛物线
(
,
、
、
为常数)与
轴交点坐标为
,与
轴交点的坐标为
,点
、点
均在这个抛物线上,点
的横坐标为
,点
的横坐标为
.当
在
的左侧时,抛物线上
、
两点之间的部分(包括
、
两点)记为图象
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/51339180-948c-495b-a98e-d9413106064e.png?resizew=230)
(1)求此抛物线对应的函数表达式.
(2)当图象
对应的函数值
随
的增大而减小时,求
的取值范围.
(3)图象
最大值与最小值差为
,求
与
之间的函数关系式.
(4)设点
的坐标为
,点
的坐标
,连结
,以
为边长向右作正方形
,当抛物线与正方形
的边只有两个交点,且交点的纵坐标之差为1时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d1d18e6130f4da5603785d46d5b4a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/51339180-948c-495b-a98e-d9413106064e.png?resizew=230)
(1)求此抛物线对应的函数表达式.
(2)当图象
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)图象
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831222ebf8eaa0ea4db34426591d246b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b29fdde701fd602d076e3518150e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8552ad9af3f75f11ec1d2aae32147fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8552ad9af3f75f11ec1d2aae32147fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-问答题
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困难
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【推荐3】综合与实践
问题提出:
中,
,点
是
边上的中点,点
、
分别为边
上的动点,连接
,若
的面积为6,
,则
周长的最小值为______.
问题探究:
(2)如图2,在矩形
中,
为对角线,若矩形的周长为12,当
的值最小时,求
的长?并说明理由.
问题解决:
(3)如图3是一个边长为900米的等边三角形空地(即在等边
中,
米),高新区管委会计划将这片空地修建成为一个公园供市民休闲放松,在修建公园时根据市广大市民.的意见作出了如下方案.
①在
和
上两条路上种植长为900米的鲜花带即
米;
②连接
交于点F,在点F处放置自动售卖机;
③过点D、F、E铺设一段圆弧形的塑胶跑道,供市民慢跑健身;
④在
上修建大门M与N(大门的宽度可以忽略不计),为了方便市民进出游玩;
⑤在两个大门和自动售卖机之间铺设沥青路面.即在M、N、F三点之间铺设了沥青路;
根据以上要求,财务部门了解到塑胶跑道的铺设成本为1000元/米,沥青路面的铺设成本为200元/米,由于高新区公共建设的资金有限,财务部门给设计部门提出如下要求:“铺设的塑胶跑道所花费用最少的条件下,铺设沥青路面所花费用否存也降到最低,如果可以做出预算,求出沥青路面费用的最小值,若不存在请说明理由?”
问题提出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a44046046a948bed18055af67b7f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ff44e1c740404f88ad3ee4528baa93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc4cd7c59e65d066440205914db41f60.png)
问题探究:
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648cf8ab7773bbd7320ce7c51188ff2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
问题解决:
(3)如图3是一个边长为900米的等边三角形空地(即在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071db1dda4cb08dafde126f316ecc236.png)
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d18c8c60c0f8c63e18922928c31ba6.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30197f7da6fb03091b98f707075e204.png)
③过点D、F、E铺设一段圆弧形的塑胶跑道,供市民慢跑健身;
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/737355fa2cd0dc9d6b91bf04ff851cfd.png)
⑤在两个大门和自动售卖机之间铺设沥青路面.即在M、N、F三点之间铺设了沥青路;
根据以上要求,财务部门了解到塑胶跑道的铺设成本为1000元/米,沥青路面的铺设成本为200元/米,由于高新区公共建设的资金有限,财务部门给设计部门提出如下要求:“铺设的塑胶跑道所花费用最少的条件下,铺设沥青路面所花费用否存也降到最低,如果可以做出预算,求出沥青路面费用的最小值,若不存在请说明理由?”
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名校
解题方法
【推荐1】如图,在平面直角坐标系中,点A在第一象限,点B在第二象限,直线
轴,垂足是D,
轴,垂足是C,AB,AD的长分别是方程
的两根.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7c346bcd-d9f1-4311-90aa-f2c9936cc833.png?resizew=246)
(1)求点C的坐标;
(2)连接CD,过点B作CD的垂线,垂足是H,交y轴负半轴于点E,
,双曲线
的一支经过点B,求k的值;
(3)在(2)条件下,点M在y轴上,点N直线BE上,是否存在点N,使以B,M,N为顶点的三角形与△BCD相似?若存在?请写出满足条件的点N的个数,并直接写出其中两个点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ea84cba8ccd585ad1da1fd204bc3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b45db8dd8768994af51206565379fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b0b55c3297ce66c96d1559d76971f4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7c346bcd-d9f1-4311-90aa-f2c9936cc833.png?resizew=246)
(1)求点C的坐标;
(2)连接CD,过点B作CD的垂线,垂足是H,交y轴负半轴于点E,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ac50d82294098898f6f2e062f6c6101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
(3)在(2)条件下,点M在y轴上,点N直线BE上,是否存在点N,使以B,M,N为顶点的三角形与△BCD相似?若存在?请写出满足条件的点N的个数,并直接写出其中两个点N的坐标;若不存在,请说明理由.
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困难
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【推荐2】【问题情境】如图1,在
中,
,点
为边
上的任一点,过点
作
,
,垂足分别为
、
,过点
作
,垂足为
.求证:
.
【结论运用】如图2,将矩形
沿
折叠,使点
落在点
上,点
落在点
处,点
为折痕
上的任一点,过点
作
、
,垂足分别为
、
,若
.
,求
的值.
【迁移拓展】图3是一个航模的截面示意图.在四边形
中,
为
边上的一点,
,
,垂足分别为
、
,且
,
,
,
;
、
分别为
、
的中点,连接
、
,求
与
的周长之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e18836bc7fee22f8f813a6f525d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7f27dc23291cfd5759ed5c7d4c4731.png)
【结论运用】如图2,将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b33837dbc762d5e023dfc035c98772e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef7eab528a8dd3e3f328de3b3ac80ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce84f6062f12bf6ef42d7b733cd2248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14aec46de991e6f8503d5f94bc00b33d.png)
【迁移拓展】图3是一个航模的截面示意图.在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0532fccfa9bae5ed1b954b9f4a2c94d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69bd4a1d9ab513764d7807261e86447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb37da9ee8ed515ceda246235d74fcdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de006cef9e5efbcbf74229845804650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44ca79d5e12bd02c393ba7f0b31c8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e705e9644995a842363e1ee3d76a6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/3f9efe65-9f24-46fb-b2f8-b06492efed10.png?resizew=521)
您最近一年使用:0次
解答题-证明题
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困难
(0.15)
名校
【推荐1】
内接于⊙
,点D在上,连接CD交AB边于点E,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/cfb14aa4-d329-4ce9-b785-82e6d1bc0848.png?resizew=435)
(1)如图1,求证:
;
(2)如图2,点F为
中点,连接BF,交弦CD于点G,交AC边于点H,求证:
;
(3)如图3,在(2)的条件下,当AB经过圆心O时,连接DF交AB边于点N,若
,
,求⊙
半径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc4d1df2ffbacb38e78bd7d874fea08.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/cfb14aa4-d329-4ce9-b785-82e6d1bc0848.png?resizew=435)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6239a6d6c4f940eed7fe0aaf0fc950f8.png)
(2)如图2,点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda7306fd1a739095f4c6576db603d4b.png)
(3)如图3,在(2)的条件下,当AB经过圆心O时,连接DF交AB边于点N,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b99216448d06545191ecde320178a6c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee3321318ae36cd1e8ad5a67042ffc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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名校
【推荐2】在
中,弦
弦
,过
作
于
,延长
交
于
,连接
相
,
.
;
(2)如图2,连接
,延长
交
于
,过
作
交
于
,连接
和
,若
,求证:
;
(3)如图3,在(2)的条件下,连接
、
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502534dfabfcea51a7a69bb3046580c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a1658e10f6c0a46bb523084676ac67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff451ffda171160ba8aa0b662898843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e37b122a7273e1251ea3860e74c896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf5839e4a3d6b66415eeee2784b56d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd4678832abebbe835f3032d11f4e49.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c03c93ce01e9c986194595004bc2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a716d3e10024a0b98e36b3d0078887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8ad4bc94a0ab0813a9a63e846ae7ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5d21a1a239d8faced5c877d825f57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a8a798e8593a6df165bff365b3f0e5.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea3025de39ca14d0602f8913ff10c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8018ee82e412e070d88104229702b9e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a18a786351489b021709c8023e7633f.png)
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