定义:对于抛物线
(
、
、
是常数,
),若
,则称该抛物线是黄金抛物线,已知平面直角坐标系
,抛物线
是黄金抛物线,与
轴交于点
,顶点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/d547864b-e629-48c2-92ac-eee5ef8d58ef.png?resizew=210)
(1)求此黄金抛物线的表达式及
点坐标;
(2)点
在这个黄金抛物线上.
①点
在这个黄金抛物线的对称轴上,求
的正弦值.
②在射线
上是否存在点
,使以点
、
、
所组成的三角形与
相似,且相似比不为1.若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.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/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88952e576a30b66b10dffebd70f71d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/d547864b-e629-48c2-92ac-eee5ef8d58ef.png?resizew=210)
(1)求此黄金抛物线的表达式及
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ccbabd8465fb5231099dca52ef6d9b3.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b4e47d8f5f232a028fa5b362b8825d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c3ca226db5d490fa92bb1b7c8deb14.png)
②在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
23-24九年级上·上海嘉定·期末 查看更多[2]
更新时间:2024-01-11 23:15:11
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相似题推荐
解答题-问答题
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名校
【推荐1】抛物线
与x轴交于
、B两点(A在B的左侧),与y输交于点
,抛物线的顶点为M.
(2)若点P是线段
上一个动点,连接
.问,是否存在点P,使得以点O、C、P为顶点的三角形与
相似?若存在,求出P点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531b752c4d04408a7332719ea3845786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c33700c3358cbbd8db376f9f0613b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd81cac5d2bcf0753819951088027d1.png)
(2)若点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知二次函数
的图象经过点A(c,-2),
.求证:这个二次函数图象的对称轴是x=3.题目中的矩形框部分是一段被墨水染污了无法辨认的文字.
(1)根据已知和结论中现有的信息,你能否求出题中的二次函数解析式?若能,请写出求解过程,并画出二次函数的图象;若不能,请说明理由.
(2)请你根据已有的信息,在原题中的矩形框中,填加一个适当的条件,把原题补充完整.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://img.xkw.com/dksih/QBM/2019/8/12/2267159895752704/2267418570784768/STEM/c9c65d206cce407ba895470f65a409da.png?resizew=55)
(1)根据已知和结论中现有的信息,你能否求出题中的二次函数解析式?若能,请写出求解过程,并画出二次函数的图象;若不能,请说明理由.
(2)请你根据已有的信息,在原题中的矩形框中,填加一个适当的条件,把原题补充完整.
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【推荐1】顶角为36°的等腰三角形称为黄金三角形,利用黄金三角形求
的准确值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0ac5e4a6ef4f217b2ffb08aea29489.png)
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【推荐2】如图,四边形
是正方形, E是
的中点,P是
边上的一点.
(1)给出一个条件,使得
与
相似并写出证明;
(2)在(1)的条件下,已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/1084d92d-87f5-447e-8556-859c29bd126a.png?resizew=132)
(1)给出一个条件,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c6c2e804ec7532d8adaa5fc1b57911.png)
(2)在(1)的条件下,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c69c48da2a1b7ce3208c1fe5e655997.png)
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解答题-作图题
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【推荐3】已知角
,探究
与角
的关系.
两个数学兴趣小组的同学在查阅资料后,分别设计了如下两个探究方案,
方案一:如图,点
在以点
为圆心,1为半径的
上,
,设
的度数为
.作
于点
,则线段① 的长度
即为
的值.
方案二:用函数
的值近似代替
的值.计算函数
的值,并在平面直角坐标系
中描出坐标为
的点.
两个小组同学汇总、记录的部分探究数据如下表所示(确到
).
若
记为
,否则记为
.
(1)①为 ,②为 ;
(2)补全表中的
或
;
(3)画出
关于
的函数图象,并写出
的近似值(精确到
),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f1876a89632d328e0809ace0ceb2fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
两个数学兴趣小组的同学在查阅资料后,分别设计了如下两个探究方案,
方案一:如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae728c7be0f0cf78711f3fa5ccccf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df51f4ea4169edec76dafdeb071510dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb3874bda8f7063dafd50ec4f566121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1830ad63b26620d7f45d5bd6e742b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
方案二:用函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0227231ab15877d707e519f82f5dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48345d239aaf8e9ca1ff2846c08a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f196f6236188084f3b2c9f2b68c05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1add0e23a7fd73b57ca8aad8fff4d5b.png)
两个小组同学汇总、记录的部分探究数据如下表所示(确到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62648b9ece7164d91e422b7223ece80.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed47a768260d970be3e57f7f1978c2be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dcecbc2e704e8aaec3541a045d8698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
0 | 10 | 20 | 30 | 40 | 45 | 50 | 60 | 70 | 80 | 90 | |
0 | ② | 1 | |||||||||
0 | |||||||||||
|
(1)①为 ,②为 ;
(2)补全表中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dcecbc2e704e8aaec3541a045d8698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
(3)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f196f6236188084f3b2c9f2b68c05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a521f1147b1e9c58402cc7a686131e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94d17c4366e6cb22fcee0f60b6a7ade5.png)
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【推荐1】如图,已经抛物线经过点
,
,且它的对称轴为
.
(2)若点
是
轴上的一点,且
为等腰三角形,请直接写出
点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685d31faa9b3bc099e4c5a11b80088f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad30bef2de572a0903b7f4bc9d88163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐2】如图,已知抛物线
与
轴交于点
、
两点,与
轴交于
点,点
的坐标为
,抛物线与直线
交于
、
两点.连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/460a000a-d794-4fdb-bbe2-afd19d6e3d7a.png?resizew=227)
(1)求抛物线对应的二次函数解析式.
(2)抛物线上有一点
,满足
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52387621283198eb16bea9c41fee46ed.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a0642d945df967d5c6e60b845fb76d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/460a000a-d794-4fdb-bbe2-afd19d6e3d7a.png?resizew=227)
(1)求抛物线对应的二次函数解析式.
(2)抛物线上有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faa2d23d9df6ea67a0f0d471bd2eec26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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真题
【推荐1】如图,抛物线
经过坐标原点
,且顶点为
.
(2)设抛物线与
轴正半轴的交点为
,点
位于抛物线上且在
轴下方,连接
、
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c918b7042bed26495b497cf74ffa59.png)
(2)设抛物线与
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f013b582858f173a9f6e8d7c34428c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】如图,直角坐标系内的梯形
(
为原点)中
,
,
,
,
.
求经过
,
,
三点的抛物线的解析式;
延长
交抛物线于点
,求线段
的长;
在
的条件下,动点
、
分别从
、
同时出发,都以每秒
个单位的速度运动,其中点
沿
由
向
运动,点
沿
由
由
运动(其中一个点运动到终点后,另一个点运动也随之停止),过点
作
交
于点
,连接
.设动点运动的时间为
秒,请你探索:当时间
为何值时,
中有一个角是直角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9040cff7e9e20dd2817ad9888237d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91d53e3c450c875e69daba15d03d873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5f5584d03eca03c1e3fa68e7257b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b42602dabcdc7bdaba0ee0af37d71f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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