如图,
中,
是中线,点
在
上,且
,
.
(1)请直接写出图中所有的相似三角形 ;
(2)求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd5e62ed6629028275bb8a4df4cd600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf18a89d2bc8795a4393d02b0f970e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/5c7f0a37-2dc6-4d07-bc9e-d4556abee1af.png?resizew=168)
(1)请直接写出图中所有的相似三角形 ;
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
更新时间:2023-07-16 00:49:55
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解答题-问答题
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【推荐1】如图,早上
一渔船以
海里/时的速度从海港
出发沿正东方向航行,在
处测得灯塔
在北偏东
方向上,航行
个小时到达
处,此时测得灯塔
在北偏东
方向,同时测得灯塔
正东方向的避风港
在
的北偏东
方向上.
______
;
(2)求海港
与灯塔
之间的距离;(结果保留根号)
(3)天气预报显示
台风将登陆渔船所在海域,渔船立即沿
方向加速驶向避风港
.出于安全考虑,渔船至少需要比台风到达所在海域的时刻提前
个小时抵达避风港
,求渔船加速后的最小速度.(结果精确到
,参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0566dc5f26c9ca4ee85d563f7babe8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeaf983d892521f36f9743d5c1bfeb40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)求海港
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)天气预报显示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794dad48d307fffae340ebb90d1cba5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52881be613aa404e553da30d8987cfad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dad09268b7cb8bfcbea010cb6d2a29e.png)
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【推荐2】如图,在
中
,
,
的角平分线与
的角平分线交于点M,将
以直线
为对称轴翻折得到
,延长
与
的延长线交于点E.求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122e177c4d664591370491c2113ca765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e6927e3bc512359dc8b0c11e195d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/b1f593d7-277b-4afa-97d1-0b7e8be515f6.png?resizew=108)
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【推荐3】教材呈现:华师版义务教育教科书数学七下第82页的部分内容.
(1)对于上述问题,在解答过程的空白处填上适当的内容(理由或数学式).
问题推广:
(2)如图,在
中,
、
的角平分线交于点P,将
沿
折叠使得点A与点P重合,若
,则
________度.
(3)如图,在
中,
的角平分线与
的外角
的角平分线交于点P,过点B作
于点H,若
,则
________度.
如图,在![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 解:∵ ![]() ![]() ∴ ![]() 同理可得 ![]() ∵ ![]() ∴ ![]() ![]() ![]() |
问题推广:
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71a2459a5341da7223bbfcfacafe17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1de94901207fc22febd4bf4760fd970.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/7a30e1ce-9216-407a-9374-53c5db6bff1e.png?resizew=107)
(3)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28537fd3056afc85c8f671e0756666f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7efb72f7cd2c61ef89c741d9f0da7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67caa956042197d36d651c4ec1a75b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73321717e30c14f45ef8515503db5997.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/912d2a76-9cc6-4381-a4a5-24514a77c0c5.png?resizew=137)
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解答题-证明题
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适中
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【推荐1】如图,
是
的
边上的中线,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/ebf8ca8f-c746-4c45-9e85-9e99d3d4448c.png?resizew=204)
(1)求证:
是直角三角形;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/ebf8ca8f-c746-4c45-9e85-9e99d3d4448c.png?resizew=204)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa17deae812d3ce8c158d75c4eb894e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】Rt
ABC中,∠ACB=90°,点D、E分别为边AB、BC上的点,且CD=CA,DE⊥AB.
(1)求证:
.
(2)联结AE,取AE的中点M,联结CM并延长与AB交于点H.求证:CH⊥AB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9427d4aefc1ca4125451e614171b6e2.png)
(2)联结AE,取AE的中点M,联结CM并延长与AB交于点H.求证:CH⊥AB.
![](https://img.xkw.com/dksih/QBM/2021/1/17/2638321532641280/2640349997694976/STEM/ab3f210d149942238b8622a829616730.png?resizew=201)
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解答题-作图题
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【推荐1】如图,在
中,
,
.
(1)求作:
的平分线
交
于点
;(要求:尺规作图,保留作图痕迹,不写作法)
(2)求证:点
为线段
的黄金分割点(即
);
(3)若
,求
的长.
![](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/ee54b9b398ce80cd054b56173fe810f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/396960f8-7670-410b-bc0a-f5c859fb04f0.png?resizew=98)
(1)求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bea4ef7a823237d84e4bae51458cef8.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】如图,正方形ABCD中,AB=2
,O是BC边的中点,点E是正方形内一动点,OE=2,连接DE,将线段DE绕点D逆时针旋转90°得DF,连接AE,CF
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215375111716864/2216954029375488/STEM/d13258792f2f4fe1a44c22d3444f2bbd.png?resizew=306)
(1)如图1,求证:AE=CF;
(2)如图2,若A,E,O三点共线,求点F到直线BC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215375111716864/2216954029375488/STEM/d13258792f2f4fe1a44c22d3444f2bbd.png?resizew=306)
(1)如图1,求证:AE=CF;
(2)如图2,若A,E,O三点共线,求点F到直线BC的距离.
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