如图,在
中,
,
,
,点M为边
的中点.点Q从点A出发,沿
以每秒1个单位长度的速度向终点C运动,同时点P从点C出发,以每秒2个单位长度的速度先沿
运动到点B,再沿
向终点A运动,以
为邻边构造
,设点Q运动的时间为t秒.
边上时,求t的值;
(2)当点P在边
上运动时,设
的面积为
,求S与t之间的函数关系式;
(3)连接
,直接写出
将
分成的两部分图形面积相等时t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](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/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e1bcd4a9a1f640dd8013d44e1a60d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96d9f661c6631ebfbafd047644f871e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)当点P在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96d9f661c6631ebfbafd047644f871e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64afd46111003aac508a003d2319d20a.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96d9f661c6631ebfbafd047644f871e.png)
更新时间:2024-05-06 14:58:51
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相似题推荐
解答题-问答题
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【推荐1】【特例感知】
(1)如图
,已知
和
是等边三角形,直接写出线段
与
的数量关系是______;
【类比迁移】
(2)如图
,
和
是等腰直角三角形,
,写出线段
与
的数量关系,并说明理由;
【拓展运用】
(3)如图
,若
,点
是线段
外一动点,
,连接
.若将
绕点
逆时针旋转得到
,连接
,求出
的最大值.
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【类比迁移】
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c2425db34d83dbe44f3ee3d2c5439b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【拓展运用】
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】
中,
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/7221f679-5a5a-452d-81c3-4487d45b379b.png?resizew=376)
(1)如图1,连接
,过点
作
,分别交
,
于点
,
.
①若
,直接写出
的度数为_________;
②求证:
.
(2)如图2,点
,
是
边上动点,连接
,
相交于点
,已知
,连接
,求证:
.
![](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/26e4e8cd6d99fb53c48d526a23536fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/7221f679-5a5a-452d-81c3-4487d45b379b.png?resizew=376)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55b6ce55e67f6e95e616eaf1ca3f6f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)如图2,点
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fbf957b17fd9caf0011318aebc591a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d462ecbfd4c6937d4a58725b809df966.png)
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解题方法
【推荐1】如图1,在矩形ABCD中,点E以lcm/s的速度从点A向点D运动,运动时间为t(s),连结BE,过点E作EF⊥BE,交CD于F,以EF为直径作⊙O.
(1)求证:∠1=∠2;
(2)如图2,连结BF,交⊙O于点G,并连结EG.已知AB=4,AD=6.
①用含t的代数式表示DF的长
②连结DG,若△EGD是以EG为腰的等腰三角形,求t的值;
(3)连结OC,当tan∠BFC=3时,恰有OC∥EG,请直接写出tan∠ABE的值.
(1)求证:∠1=∠2;
(2)如图2,连结BF,交⊙O于点G,并连结EG.已知AB=4,AD=6.
①用含t的代数式表示DF的长
②连结DG,若△EGD是以EG为腰的等腰三角形,求t的值;
(3)连结OC,当tan∠BFC=3时,恰有OC∥EG,请直接写出tan∠ABE的值.
![](https://img.xkw.com/dksih/QBM/2020/3/14/2419422488625152/2420274440617984/STEM/498d46da05ac404f90f77f353fd7b01a.png?resizew=341)
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真题
名校
【推荐2】已知四边形ABCD是菱形,AB=4,∠ABC=60°,∠EAF的两边分别与射线CB,DC相交于点E,F,且∠EAF=60°.
![](https://img.xkw.com/dksih/QBM/2016/8/16/1574229620924416/1574229627207680/STEM/81ea5eb6-c326-4c29-889f-9a0e00f27557.png)
![](https://img.xkw.com/dksih/QBM/2016/8/16/1574229620924416/1574229627207680/STEM/c1d696e9-3477-4e57-af64-f26b409c4d01.png)
![](https://img.xkw.com/dksih/QBM/2016/8/16/1574229620924416/1574229627207680/STEM/5935b8bf-fc5c-4385-ad9b-fddd01c10605.png)
(1)如图1,当点E是线段CB的中点时,直接写出线段AE,EF,AF之间的数量关系;
(2)如图2,当点E是线段CB上任意一点时(点E不与B、C重合),求证:BE=CF;
(3)如图3,当点E在线段CB的延长线上,且∠EAB=15°时,求点F到BC的距离.
![](https://img.xkw.com/dksih/QBM/2016/8/16/1574229620924416/1574229627207680/STEM/81ea5eb6-c326-4c29-889f-9a0e00f27557.png)
![](https://img.xkw.com/dksih/QBM/2016/8/16/1574229620924416/1574229627207680/STEM/c1d696e9-3477-4e57-af64-f26b409c4d01.png)
![](https://img.xkw.com/dksih/QBM/2016/8/16/1574229620924416/1574229627207680/STEM/5935b8bf-fc5c-4385-ad9b-fddd01c10605.png)
(1)如图1,当点E是线段CB的中点时,直接写出线段AE,EF,AF之间的数量关系;
(2)如图2,当点E是线段CB上任意一点时(点E不与B、C重合),求证:BE=CF;
(3)如图3,当点E在线段CB的延长线上,且∠EAB=15°时,求点F到BC的距离.
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【推荐3】如图,在Rt
ABC中,∠ACB=90°,AC=3,BC=4.动点D从点C出发以每秒1个单位的速度沿CA向点A运动、同时点E从点A出发以每秒2个单位的速度沿AB向终点B运动,以DC、DE为邻边作平行四边形DEFC,当点E到达点B时,点D也随之停止运动.设点D的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/3e379444-3dec-466c-b51e-49b5c70778f3.png?resizew=158)
(1)用含t的代数式表示BE的长.
(2)当DE
BC时,求t的值.
(3)当点F落在
ABC一边的垂直平分线上时,直接写出t的值.
(4)以DC为边向左侧作正方形DCMN.当平行四边形DEFC的一边所在直线把正方形DCMN的面积分成1:3两部分时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/3e379444-3dec-466c-b51e-49b5c70778f3.png?resizew=158)
(1)用含t的代数式表示BE的长.
(2)当DE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(3)当点F落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(4)以DC为边向左侧作正方形DCMN.当平行四边形DEFC的一边所在直线把正方形DCMN的面积分成1:3两部分时,直接写出t的值.
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【推荐1】折纸是一种常见的游戏,九年级兴趣小组以“矩形的折叠”为主题开展数学活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/5f0c99de-9572-47a3-81af-770c97760b9b.png?resizew=449)
(1)操作判断:如图1,在矩形纸片
中,
,首先沿过点B的直线翻折,使点A落在
边上的点E处,折痕为
,连接
;此时,就可以得到一个四边形
,则四边形
的形状是哪种特殊的四边形?答:____.
(2)深入探究:继续沿过点E的直线翻折,使点C落在
边上的点G处,折痕为
,连接
,延长
交
于点M,连接
.
①求证:
;
②猜想线段
和
的数量关系,并证明;
(3)拓展应用:延长
交矩形
的边于点N,若
,直接写出
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/5f0c99de-9572-47a3-81af-770c97760b9b.png?resizew=449)
(1)操作判断:如图1,在矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c4e3cf5aa65a81a357c97a6b7ee5d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
(2)深入探究:继续沿过点E的直线翻折,使点C落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4b3a67756026228ce37056e00e5b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d18e66f7066a1fdf2cb167a4862128c.png)
②猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96acb7106e9572759b31cb9b765b3af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
(3)拓展应用:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee2f46269ea85f3eb81c9a432814ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d546a5fbdf0496e6f563810d5bc4c627.png)
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【推荐2】转化是解决数学问题常用的思想方法之一,它可以在数与数、数与形、形与形之间灵活应用.
如图1,已知在
中,
,
,
.请解答下面的问题:
(1)基础巩固
如图1,将
绕点
按顺时针方向旋转
得到
,连接
,则
与
之间的数量关系是__________;
(2)拓展探究
如图2,点
,
分别是
,
的中点,连接
,将
绕点
按顺时针方向旋转
得到
.
①求证:
;
②用等式表示
与
之间的数量关系,并说明理由;
(3)问题解决
点
,
分别是
,
的中点,连接
,将
绕点
旋转得到
,请直接写出点
,
,
在同一直线上时
的长.
如图1,已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/47b7ef64-0394-4d05-ac2e-58ab1ab7a1f6.png?resizew=543)
(1)基础巩固
如图1,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edac7b4974ff61fa11bfe0d9b88f689f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
(2)拓展探究
如图2,点
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425566da23de498104844b7d691af4eb.png)
②用等式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(3)问题解决
点
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/e69d2b798744645af88a4fa411344a83.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐3】定义:我们知道,四边形的一条对角线把这个四边形分成了两个三角形,如果这两个三角形相似(不全等),我们就把这条对角线叫做这个四边形的“相似对角线”.
理解:
(1)如图1,
的三个顶点均在正方形网格中的格点上,若四边形
是以
为“相似对角线”四边形,请用无刻度的直尺在网格中画出点D(保留画图痕迹,找出2个即可);
(2)①如图2,在四边形
中,
,
,对角线
平分
.请问
是四边形
的“相似对角线”吗?请说明理由;
②若
,求
的值.
运用:
(3)如图3,已知
是四边形
的“相似对角线”,
.连接
,若
的面积为
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/3/dfb5d76a-00fb-4984-ba3b-a0d830893e4f.png?resizew=516)
理解:
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)①如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e30ffe627436f57ecf46b89c57bb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d9fce8285e9134f63924be5cd8770f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6a2c8281affdad197fd29081c763ce.png)
运用:
(3)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a54f7ef0b54526b4b66e3825f1a997a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7dc603317eb90974c75efec9f02b1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图1,已知锐角△ABC的高AD、BE相交于点F,延长AD至G,使DG=FD,连接BG,CG.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892608644997120/2893534234353664/STEM/155a659c-1bc9-4958-853a-378cad141523.png?resizew=332)
(1)求证:
;
(2)如果
,设
.
①如图2,当∠ABG=90°时,用含m的代数式表示△BFG的面积;
②当AB=8,且四边形BGCE是梯形时,求m的值.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892608644997120/2893534234353664/STEM/155a659c-1bc9-4958-853a-378cad141523.png?resizew=332)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c16543c00b2dc8b065d472e51b645d7.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5742cf003ad2dacfdd66fab57de7bee.png)
①如图2,当∠ABG=90°时,用含m的代数式表示△BFG的面积;
②当AB=8,且四边形BGCE是梯形时,求m的值.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐2】如图,在平面直角坐标系中,直线
与
轴交于点
,与
轴交于点
.抛物线
经过点
和点
,与
轴交于另一点
,连接
.
(1)求点
的坐标;
(2)若点
在直线
上方的抛物线上,连接
,
,当
与
的面积比等于
时,直接写出点
的坐标;
(3)在(2)的条件下,点
在
轴的负半轴,连接
,
,当
时,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1882d2f789de61b5b7e3ec952e13b99e.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/22e59da5115d0dafea24822245f92c48.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/4bc20695-012d-4efc-8744-8ad736a7922f.png?resizew=301)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca909f9ab4dbd8b479c2c7ca4bea2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4806fb7f95f63e863c287faa51f8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bdbbd3084ddc946e12d530d2192522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026971dae940bc6cba4e7f366bc5b83e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
您最近一年使用:0次