如图,在
中,
,
点
从点
出发,沿
方向以每秒
个单位长度的速度向终点
运动.点
为边
的中点,连结
,以
和
为边作
,设点
运动的时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/1a9bf9ba-d3f7-4f3f-99ac-6a0b55427cd9.png?resizew=392)
(1)用含
的代数式表示线段
的长;
(2)当点
落在边
上时,求
的值及此时
与
重叠部分图形的面积.
(3)当
与
重叠部分图形为轴对称图形时,求
的值.
(4)作点
关于直线
的对称点
,当点
落在▱
内部时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7880152c480a4d06b64c72b141b27cc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be71bf960f1f948074b3b2e09f171dc.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54382f12e727787044b2c6a9c7861aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/1a9bf9ba-d3f7-4f3f-99ac-6a0b55427cd9.png?resizew=392)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54382f12e727787044b2c6a9c7861aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54382f12e727787044b2c6a9c7861aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fd0c487e428ca6dce10d10011b06fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2022-11-09 15:04:29
|
相似题推荐
解答题-证明题
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真题
【推荐1】如图,正方形
边长为
,点E为对角线
上一点,
,点P在
边上以
的速度由点A向点B运动,同时点Q在
边上以
的速度由点C向点B运动,设运动时间为t秒(
).
.
(2)当
是直角三角形时,求t的值.
(3)连接
,当
时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/121e9b7080514f5a33858d72e28d60a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9651ef497f8bd97926c87cbef23392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8687deb0d5067af923dbe174dbe3d0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17277a306d4d0a0a0cf293f87802cf66.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5356aa2b9c8d9fdf81c48d1205a750e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9837eb5ae9180b64dadfbd2fdfb9da8e.png)
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【推荐2】[问题提出]
(1)如图1,已知线段AB=4,点C是一个动点,且点C到点B的距离为2,则线段AC长度的最大值是________;
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939824040058880/2942611952443392/STEM/8ee20fb6-45d8-44d0-9dcd-c1271319bbcb.png?resizew=88)
[问题探究]
(2)如图2,以正方形ABCD的边CD为直径作半圆O,E为半圆O上一动点,若正方形的边长为2,求AE长度的最大值;
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939824040058880/2942611952443392/STEM/38348afa-16f0-4465-872f-8b14d6728ae6.png?resizew=144)
[问题解决]
(3)如图3,某植物园有一块三角形花地ABC,经测量,AC=20
米,BC=120米,∠ACB=30°,BC下方有一块空地(空地足够大),为了增加绿化面积,管理员计划在BC下方找一点P,将该花地扩建为四边形ABPC,扩建后沿AP修一条小路,以便游客观赏.考虑植物园的整体布局,扩建部分
BPC需满足∠BPC=60°.为容纳更多游客,要求小路AP的长度尽可能长,问修建的观赏小路AP的长度是否存在最大值?若存在,求出AP的最大长度;若不存在,请说明理由.
(1)如图1,已知线段AB=4,点C是一个动点,且点C到点B的距离为2,则线段AC长度的最大值是________;
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939824040058880/2942611952443392/STEM/8ee20fb6-45d8-44d0-9dcd-c1271319bbcb.png?resizew=88)
[问题探究]
(2)如图2,以正方形ABCD的边CD为直径作半圆O,E为半圆O上一动点,若正方形的边长为2,求AE长度的最大值;
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939824040058880/2942611952443392/STEM/38348afa-16f0-4465-872f-8b14d6728ae6.png?resizew=144)
[问题解决]
(3)如图3,某植物园有一块三角形花地ABC,经测量,AC=20
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939824040058880/2942611952443392/STEM/9729c710-6492-46cf-9d2e-b0d320de65ca.png?resizew=164)
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【推荐1】如图
,在平面直角坐标系中,线段
的两个端点分别为
,
,将线段
向右平移
个单位长度,得到线段
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)直接写出点
、点
的坐标
(2)如图
,延长
交
轴于点
,点
是线段
上的一动点,连接
、
,猜想
、
、
之间的数量关系,并说明理由
(3)在
轴上是否存在点
,使
的面积与四边形
的面积相等,若存在,求出
的坐标,若不存在,请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40630a669f4eedf626bc24851df10c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e30645f36e8628b9e25d53598d5174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/5e53e18e-41d1-4b88-aae8-736d5d7560e4.png?resizew=534)
(1)直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9cc98e6df306063e645044f0faa7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d451070229ac0bbba9fe73dbd9600602.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902a6e4e4d161cfa66773ccfc6547c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】如图,矩形ABCD中,AB=12,AD=9,E为BC上一点,且BE=4,动点F从点A出发沿射线AB方向以每秒3个单位的速度运动.连结DF,DE, EF. 过点E作DF的平行线交射线AB于点H,设点F的运动时间为t(不考虑D、E、F在一条直线上的情况).
![](https://img.xkw.com/dksih/QBM/2012/3/5/1573351159660544/1573351192174592/STEM/dc6a7626c1f5400598279f7b0ff27135.png?resizew=264)
(1) 填空:当t= 时,AF=CE,此时BH= ;
(2)当△BEF与△BEH相似时,求t的值;
(3)当F在线段AB上时,设△DEF的面积为S,△DEF的周长为C.
① 求S关于t的函数关系式;
② 直接写出周长C的最小值.
![](https://img.xkw.com/dksih/QBM/2012/3/5/1573351159660544/1573351192174592/STEM/dc6a7626c1f5400598279f7b0ff27135.png?resizew=264)
(1) 填空:当t= 时,AF=CE,此时BH= ;
(2)当△BEF与△BEH相似时,求t的值;
(3)当F在线段AB上时,设△DEF的面积为S,△DEF的周长为C.
① 求S关于t的函数关系式;
② 直接写出周长C的最小值.
![](https://img.xkw.com/dksih/QBM/2012/3/5/1573351159660544/1573351192174592/STEM/ea728ee4a0904b86ab7adeb0d7acbeb2.png?resizew=240)
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【推荐1】如图,点
在数轴上对应的数是
,以原点
为圆心、
的长为半径作优弧
,使点A在原点的左上方,且
,点
为
的中点,点
在数轴上对应的数为4.
(1)
___________;
(2)点
是优弧
上任意一点,则
的最大值为___________;
(3)在(2)的条件下,当
最大,且
时,固定
的形状和大小,以原点
为旋转中心,顺时针旋转
.
①连接
,
,在旋转过程中,
与
有何数量关系,并说明理由;
②直接写出在旋转过程中,点
到
所在直线的距离d的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d97d93f28c7c9e685cae7a0bc74afad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/03e57e3a-59b5-4e7f-aa8f-e71d67b4a10c.png?resizew=200)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d36297cf4adb6684e875a4588b1989.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef8133d0f3942399d3d727cec8b22c1.png)
(3)在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef8133d0f3942399d3d727cec8b22c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264c8803f48fbb408328daa3a4be6ea3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f798e4487f5b752ea1caa829f68dac90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60057103273cbf497495520528da7dda.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②直接写出在旋转过程中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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真题
名校
【推荐2】如图(1)所示,已知在
中,
,
在边
上,点
为边
中点,为以
为圆心,
为半径的圆分别交
,
于点
,
,联结
交
于点
.
,求证:四边形
为平行四边形;
(2)如图(2)所示,联结
,如果
,求边
的长;
(3)联结
,如果
是以
为腰的等腰三角形,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8da10b2137a1e87801556a313e625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.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/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aef30e0197389432d370a15f31ed6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f2ab2ed9378fa2c1a24ab16a97be1e.png)
(2)如图(2)所示,联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797ee0d1476db4fcfd287ebf51b0b79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
(3)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2acc92168e9c5783240ade1160a8997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eab2c3682886b813bb39e3b7d517a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b8d944622210c6d755690da957007e.png)
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较难
(0.4)
名校
【推荐1】如图,
是
的直径,
是
上的一点,连接
,
,
是
上的一点,过点
作
的垂线,与线段
交于点
,点
在线段
的延长线上,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/6cb27334-3ecd-46a6-8f2d-351ac598e7ad.png?resizew=154)
(1)求直线
与
的公共点个数,并说明理由;
(2)当点
恰为
中点时,若
的半径为
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a09981c03e8e6c00b7a65c56d95050.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/6cb27334-3ecd-46a6-8f2d-351ac598e7ad.png?resizew=154)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6beb17d468d0e90f9c08a8dbbc05541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
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较难
(0.4)
【推荐2】如图所示,A、B为两个村庄,AB、BC、CD为公路,BD为地,AD为河宽,且CD与AD互相垂直.现在要从E处开始铺设通往村庄A、村庄B的一电缆,共有如下两种铺设方案:
方案一:
; 方案二:
.
经测量得AB=4
千米,BC=10千米,CE=6千米,∠BDC=45°,∠ABD=15°.已知:地下电缆的修建费为2万元/千米,水下电缆的修建费为4万元/千米.
(1)求出河宽AD(结果保留根号);
(2)求出公路CD的长;
(3)哪种方案铺设电缆的费用低?请说明你的理由.
方案一:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5094c5f137f66b1cecc16a909a5196b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0070b5d5bb191d9826280b62734630.png)
经测量得AB=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求出河宽AD(结果保留根号);
(2)求出公路CD的长;
(3)哪种方案铺设电缆的费用低?请说明你的理由.
![](https://img.xkw.com/dksih/QBM/2018/8/16/2011766091972608/2014284334489600/STEM/cc62e005e6bc4e59a53e4eac60b9d935.png?resizew=121)
您最近一年使用:0次