如图,在平面直角坐标系
中,
,
,
,
轴于点C,
轴于点D,且E是y轴正半轴上的一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/ccad5c2f-6280-48cd-9c4f-465a7842c0b8.png?resizew=411)
(1)求点E的坐标;(用含m的式子表示)
(2)如备用图1,已知
,连接
,若
,则:
①求m的值;
②如备用图2,若P,Q分别是线段
,射线
上的一点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a45588210b9c3e940777323bfae001.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be8fb59da24f78d282c87ed75d033dac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2241bd71e0c20867029e489f9ba655d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602f64f0c8a0fa105d583d698d0af3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/ccad5c2f-6280-48cd-9c4f-465a7842c0b8.png?resizew=411)
(1)求点E的坐标;(用含m的式子表示)
(2)如备用图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c666dbeaa34e5174e45c2429c51cef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907939554504636392306f3bd2af9af8.png)
①求m的值;
②如备用图2,若P,Q分别是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abadfde07ca1f370d235f976378ed69.png)
更新时间:2023-04-13 20:01:02
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相似题推荐
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【推荐1】如图,在平面直角坐标系中,直线
与y轴交于点A,与直线
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/a0e8e5cf-3ab1-4f79-a57b-a02a858d4f9e.png?resizew=365)
(1)求m和b的值;
(2)求证:
是直角三角形;
(3)直线
上是否存在点D,使得
,若存在,请求出点D的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a47ab5a604e0a8fb9af1e53f2a9b3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/687af2a036f33025986c48912e267254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49753619c62e49d6375aa8a7059cbd09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/a0e8e5cf-3ab1-4f79-a57b-a02a858d4f9e.png?resizew=365)
(1)求m和b的值;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4118371d533ddb58493abcaf8dcb9.png)
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【推荐2】数轴是初中数学的一个重要工具,利用数轴可以将数与形完美结合.通过研究数轴,我们发现了许多重要的规律,比如:数轴上点A和点B表示的数为a,b,则A,B两点之间的距离
.若点A表示的数a为最大的负整数,点B表示的数b在原点右侧,且绝对值为6,则
(1)点A表示的数a为______,点B表示的数b为______,数轴上A,B两点之间的距离为______;
(2)满足
的实数x的值为______;
(3)
的最小值为______;
(4)满足
的实数x的值为______;
(5)若正实数c满足
,则当x的值为______时,
取到最小值______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afd4acb164aad6d5a73989f5412730b.png)
(1)点A表示的数a为______,点B表示的数b为______,数轴上A,B两点之间的距离为______;
(2)满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e6a81dd80e7920850fac12ca28612.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d734692c715228c89381014e78d4dc5.png)
(4)满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19dd401f4f051243f5c9d0b4f3f460c.png)
(5)若正实数c满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea837c6e042399a6ebfaf724f78ba46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffb20877725fdaa3d489982de593a3b.png)
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【推荐3】对于平面直角坐标系xOy中的点P,Q,给出如下定义:若P,Q为某个三角形的顶点,且边PQ上的高h,满足h=PQ,则称该三角形为点P,Q的“完美三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/1ff3efc0-224a-44e8-bbf1-b7e3bba8237c.png?resizew=567)
(1)如图1,已知点A,B在x轴上,点C在y轴上,AB=3,BC=6,∠OBC=30°,试判断△ABC是否是点A,B的“完美三角形”,并说明理由;
(2)如图2,已知A(4,0),点B在x轴上,点C在直线
上,若Rt△ABC是点A,B的“完美三角形”,求点B的坐标;
(3)如图3,已知过点R(-1,1)的直线
与直线
交于点S,点M是直线RS右侧一点,且满足△RSM为点R,S的“完美三角形”,点N是x轴上的一个动点,请直接写出RN+NM的最小值和此时点M的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/28/1ff3efc0-224a-44e8-bbf1-b7e3bba8237c.png?resizew=567)
(1)如图1,已知点A,B在x轴上,点C在y轴上,AB=3,BC=6,∠OBC=30°,试判断△ABC是否是点A,B的“完美三角形”,并说明理由;
(2)如图2,已知A(4,0),点B在x轴上,点C在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daab03b1642f1ea187c94f62088ac0fd.png)
(3)如图3,已知过点R(-1,1)的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6ef43ad29077d67b4035748729a5c1.png)
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【推荐1】数学活动课上,老师让同学们以“矩形的折叠”为主题开展数学活动.
操作一:对折矩形纸片
,使
与
重合,得到折痕
,把纸片展平;
操作二:在
边上选一点P,沿
折叠,使点A落在矩形内部点M处,把纸片展平,连接
、
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ba748e6e8f07a4b3cb1c02a2951046.png)
根据以上操作,如图1,当点M在
上时,连接
,判断
的形状并证明.
(2)迁移探究
小华将矩形纸片换成正方形纸片
,且边长为
,继续探究,过程如下:
①将正方形纸片
按照(1)中的方式操作,并延长
交
于点Q,连接
.如图2,当点M在
上时,求
的长;
②点P在边
上,将
沿直线
翻折,使得点A落在正方形内的点M处,连接
并延长交正方形
一边于点G.当
时,
的长为____.
操作一:对折矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
操作二:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ba748e6e8f07a4b3cb1c02a2951046.png)
根据以上操作,如图1,当点M在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
(2)迁移探究
小华将矩形纸片换成正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
①将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
②点P在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd178e1add4b485f64fbe7fd3eecf4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
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【推荐2】阅读理解题
(1)阅读理解:如图①,等边
内有一点
,若点
到顶点
,
,
的距离分别为3,4,5,求
的大小.
思路点拨:考虑到
,
,
不在一个三角形中,采用转化与化归的数学思想,可以将
绕顶点
逆时针旋转
到
处,此时
,这样,就可以利用全等三角形知识,结合已知条件,将三条线段的长度转化到一个三角形中,从而求出
的度数.请你写出完整的解题过程.
(2)变式拓展:请你利用第(1)题的解答思想方法,解答下面问题:
已知如图②,
中,
,
,
、
为
上的点且
,
,
,求
的大小.
(3)能力提升:如图③,在
中,
,
,
,点
为
内一点,连接
,
,
,且
,请直接写出
的值,即
______.
(1)阅读理解:如图①,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
思路点拨:考虑到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2694c32ca1e120e988012b7ecd74f625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee6712495de296b164ca4af329b1107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6c2cd457c7b996d59b6fa232dd622c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(2)变式拓展:请你利用第(1)题的解答思想方法,解答下面问题:
已知如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10d461a7c0b86a2f09c2ea17f38260e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60572975f9ac06ffc8d98ef94de49eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)能力提升:如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765ee49bfe09fed44327e8be2347dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c62635ee088808196e070c44ba6c20fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9666caf29b53ddaac151174f5de8f19f.png)
![](https://img.xkw.com/dksih/QBM/2019/12/27/2364186780499968/2367146177421313/STEM/1bcea4a6-50a5-4493-bf39-f7f27f6a7e9d.png)
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【推荐1】如图1,在平面直角坐标系中将
向下平移3个单位长度得到直线
,直线
与x轴交于点C;直线
:
与x轴、y轴交于A、B两点,且与直线
交于点D.
填空:点A的坐标为______,点B的坐标为______;
直线
的表达式为______;
在直线
上是否存在点E,使
?若存在,则求出点E的坐标;若不存在,请说明理由.
如图2,点P为线段AD上一点
不含端点
,连接CP,一动点H从C出发,沿线段CP以每秒1个单位的速度运动到点P,再沿线段PD以每秒
个单位的速度运动到点D后停止,求点H在整个运动过程中所用时间最少时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44078124e6c21ccdd2e0236836ae4bb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea5c8fe935beac660eda538e59cd43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e127daadf14bb6aaf557b717eb27ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d724c915585abd7824c0127f855cd707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e636bddc1a3d7c006ac304e96cd2551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://img.xkw.com/dksih/QBM/2019/4/9/2178671101206528/2179659321729024/STEM/5d6fd51a47be41089981b44ace7125b2.png?resizew=472)
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名校
【推荐2】在平面直角坐标系
中,对于线段
和点
,给出如下定义:若在直线
上存在点
,使得四边形
为平行四边形,则称点
为线段
的“关联点”.已知
,
.
(1)在
,
,
,
中,线段
的“关联点”是___________;
(2)若点
在第二象限且点
是线段
“关联点”,求线段
长度
的取值范围;
(3)已知正方形
边长为1.以
为中心且各边与坐标轴垂直或平行,点
,
在线段
上(
在
的下方).若正方形
上的任意一点都存在线段
,使得该点为线段
的“关联点”,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](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/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712d9d9e29645c1df6ae23125b4aa1cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215cf9cfac95af95708707f14438675f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8159754fa962579d7dcb79da0ba1908.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/0a74b74e-39a3-40e9-9523-ed8c4d957551.jpg?resizew=248)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a80b19d4b513a1b04728736733e83af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ba94f77c5c1e61846d47ade2feaf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9f9311e904b5806b8743f2cfdaa61c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b5ccc27a2edd2d659f8cd41b89938f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若点
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91703e4c290fba7adf9e9718b7d364f7.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/f52a58fbaf4fea03567e88a9f0f6e37e.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/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐1】如图,在平面直角坐标系中,菱形
的四个顶点在坐标轴上,C,D两点的坐标分别是
,
,
于E,F是
的中点,点
在直线
上.
的解析式;
(2)当
的值最小时,求点P的坐标;
(3)当
是等腰三角形,且
时,写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c0f646b527953bdc1a012f4df977f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc43e72034cfce8e9d75b55c537287c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f1ed91787aece4f9f5feba5d5419ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f677e003d5e58b5d8bfd93c6e20e648f.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd28db93364ac2a6f0e75ed245dbbfd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5f0d374837655cc286d326305da36.png)
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【推荐2】唐朝诗人李颀的诗《古从军行》开头两句说:“白日登山望烽火,黄昏饮马傍交河.”诗中隐含着一个有趣的数学问题——将军饮马问题:
如图1所示,诗中将军在观望烽火之后从山脚下的A点出发,走到河旁边的P点饮马后再到B点宿营.请问怎样走才能使总的路程最短?
作法如下:如图1,从
出发向河岸引垂线,垂足为
,在
的延长线上,取
关于河岸的对称点
,连接
,与河岸线相交于
,则
点就是饮马的地方,将军只要从A出发,沿直线走到
,饮马之后,再由
沿直线走到
,所走的路程就是最短的.
如图2,在等腰梯形
中,
,点
、
是底边
与
的中点,连接
,在线段
上找一点
,使
最短.
作点
关于
的对称点,恰好与点
重合,连接
交
于一点,则这点就是所求的点
,故
的最小值为_______.
(2)实践运用
如图3,已知
的直径
,点A在圆上,且
的度数为
,点
是弧
的中点,点
在直径
上运动,求
的最小值.
(3)拓展迁移
如图,已知抛物线
的对称轴为
,且抛物线经过
两点,与
轴交于另一点
.
①求这条抛物线所对应的函数关系式;
②在抛物线的对称轴直线
上找到一点
,使
周长最小,请求出此时点
的坐标与
周长最小值.
如图1所示,诗中将军在观望烽火之后从山脚下的A点出发,走到河旁边的P点饮马后再到B点宿营.请问怎样走才能使总的路程最短?
作法如下:如图1,从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
如图2,在等腰梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2748b4fa5453d3ceacaca1381cb00af.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8aaf5f7e6230966913f9fa7fbd091.png)
作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/85a8aaf5f7e6230966913f9fa7fbd091.png)
(2)实践运用
如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c096bd244d7e30e8ef26fb5278aac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7098c45594103b46e6b57cfc6023e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8aaf5f7e6230966913f9fa7fbd091.png)
(3)拓展迁移
如图,已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc90b02a4cd1425aabfc192b1cdee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fb681aca7c2bd3ed8ce68490a22f75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①求这条抛物线所对应的函数关系式;
②在抛物线的对称轴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddb32a7a5c157fdf8aa049b2d665b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddb32a7a5c157fdf8aa049b2d665b4c.png)
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