在正方形
中,
,点E为对角线
上一点(不与B、D重合),且
,连接
,过点E作
交
于点F,请根据题意,补全图形.
,求证:
:
(2)当点F恰为
的三等分点时,求
的长;
(3)作
平分
交
于点G.交
于点H,当
时,试判断
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b22529fdccd1f84fa42eb23df0cb2d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00334461f72c07c50e1d46679eb98378.png)
(2)当点F恰为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
更新时间:2023-07-05 19:35:29
|
相似题推荐
解答题-证明题
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较难
(0.4)
【推荐1】如图1,在平面直角坐标系中,正方形ABCD顶点C(3,0),顶点D(0,4),过点A作AF⊥y轴于F点,过点B作x轴的垂线交过A点的反比例函数y=
(k>0)的图象于E点,交x轴于G点.
(1)求证:△CDO≌△DAF.
(2)求反比例函数解析式及点E的坐标;
(3)如图2,过点C作直线l∥AE,在直线l上是否存在一点P使△PAC是等腰三角形?若存在,求P点坐标,不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
(1)求证:△CDO≌△DAF.
(2)求反比例函数解析式及点E的坐标;
(3)如图2,过点C作直线l∥AE,在直线l上是否存在一点P使△PAC是等腰三角形?若存在,求P点坐标,不存在说明理由.
![](https://img.xkw.com/dksih/QBM/2019/8/15/2269312414294016/2270068162207744/STEM/7e5bc79b0abc437092a739528822648b.png?resizew=318)
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【推荐2】问题探究
(1)如图1,在
中,
,点D是
的中点,
于点E.求证:
;
(2)如图2,在
中,连接
,
平分
,交
于E,
平分
,交
于F.当
与
满足什么关系时,四边形
是矩形?请说明理由;
问题解决
(3)某地为改进城市旅游景观面貌、提高市民的生活幸福指数,城建部拟规划一个形如四边形
的动植物园(如图3),沿对角线
、
分别修建观赏小径(宽度忽略不计),已知
米,
米,
,根据设计要求,现要将三角形
区域设为熊猫娱乐区,为了游客的安全起见,将熊猫娱乐区周围筑起护栏.求所需护栏的长度(
的周长)以及该动植物园所占面积(四边形
的面积).
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0a60da10f6a874e8c2faf4a03cb4a9.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c15b30bd155641e548a7d8c172dd4.png)
问题解决
(3)某地为改进城市旅游景观面貌、提高市民的生活幸福指数,城建部拟规划一个形如四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93ad7113719bcf8b499108c4d98b3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2dcf2debb4c733c88061662bd22a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3dbbb7943be3d41a44b51e1ca3532c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,梯形ABCD中,AD//BC,
,且
,
.点M为边BC上一动点,联结AM并延长交射线DC于点F,作
交射线BC于点E、交边DC于点N,联结EF.
(1)当
时,求CF的长;
(2)联结AC,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aae63de002726bceb259b353d77f31.png)
(3)设
,
,求y关于x的函数关系式,并写出定义域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51b89f545616ef48f3706850107ad95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2eb084fc85f63c963fd0f596f2394b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b09f34fb06ae90a8d7b1a25ea01645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c5f5a9465debbe9001a1a2323c584c.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a034723f5e88d17110ccf016a27542b1.png)
(2)联结AC,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aae63de002726bceb259b353d77f31.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d794fa98ade13e9a141b45a139844914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e21bf3bb41f4648070c41f0f283945c.png)
![](https://img.xkw.com/dksih/QBM/2020/10/24/2577760704724992/2578627557728256/STEM/9cfffbfc-4056-42cd-9599-97eb0aa4b791.png?resizew=172)
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解答题-作图题
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较难
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【推荐2】如图1,在四边形ABCD中,AC为四边形对角线,在
ACD的CD边上取一点P,连接AP,如果
APC是等腰三角形,且
ABC与
APD相似,则我们称
APC是该四边形CD边上的“等腰邻相似三角形”.
![](https://img.xkw.com/dksih/QBM/2021/12/22/2877921954742272/2880841561677824/STEM/f3e898ed-0253-48c1-977c-dae8be774ef8.png?resizew=437)
(1)如图2,在平行四边形ABCD中,∠B=45°,若
APC是CD边上的“等腰邻相似三角形”,且AP=PC,∠BAC=∠DAP,则∠PCA的度数为 ;
(2)如图3,在四边形ABCD中,若∠BCA=∠D=3∠CAD,∠BAC=2∠CAD,请在图3中画出一个AD边上的“等腰邻相似三角形APC”,并说明理由;
(3)已知Rt
APC,若Rt
APC是某个四边形ABCD的“等腰邻相似三角形”,且AP=PC=1,
ABC与
APC相似,求出对角线BD长度的所有可能值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/12/22/2877921954742272/2880841561677824/STEM/f3e898ed-0253-48c1-977c-dae8be774ef8.png?resizew=437)
(1)如图2,在平行四边形ABCD中,∠B=45°,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)如图3,在四边形ABCD中,若∠BCA=∠D=3∠CAD,∠BAC=2∠CAD,请在图3中画出一个AD边上的“等腰邻相似三角形APC”,并说明理由;
(3)已知Rt
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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解题方法
【推荐3】【问题背景】
沿
折叠,使得
与
重合,则
的度数为
;
【问题探究】
(2)如图2,在
中,E、F分别为
、
的中点,
是对角线,且
,判断四边形
的形状,并说明理由;
【问题解决】
(3)如图3是一个矩形木板,已知
,点E、F分别是
、
的中点,现要制作一块直角三角形(
)的木楔,要求该木楔的直角顶点M是
的中点,点P在
边上.木匠师傅在这块木板上的作法如下:
①连接
,以点B为圆心,
的长为半径作弧,交
于点
,交边
于点Q;
②连接
并延长,与
的交点是点M的位置;
③作
的平分线交
于点H,连接
并延长,与
的交点是点P的位置.
请问,若按上述作法,制作的
木楔是否符合要求?请说明理由.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
【问题探究】
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
【问题解决】
(3)如图3是一个矩形木板,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf9f82d06b918dc2c74859d025cb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6837ac46c57fff9d7a7b17eb9c0a6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
③作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9555c0b7d2f237b1915101bc75e6140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
请问,若按上述作法,制作的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17ae7d7f5a3bba2a5fe4f84a3b96bde7.png)
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【推荐1】定义:若a,b,c是△ABC的三边,且a2+b2=2c2,则称△ABC为“方倍三角形”.
(1)对于①等边三角形②直角三角形,下列说法一定正确的是 .
A.①一定是“方倍三角形”B.②一定是“方倍三角形”
C.①②都一定是“方倍三角形”D.①②都一定不是“方倍三角形”
(2)若Rt△ABC是“方倍三角形”,且斜边AB=
,则该三角形的面积为 ;
(3)如图,△ABC中,∠ABC=120°,∠ACB=45°,P为AC边上一点,将△ABP沿直线BP进行折叠,点A落在点D处,连接CD,AD.若△ABD为“方倍三角形”,且AP=
,求△PDC的面积.
(1)对于①等边三角形②直角三角形,下列说法一定正确的是 .
A.①一定是“方倍三角形”B.②一定是“方倍三角形”
C.①②都一定是“方倍三角形”D.①②都一定不是“方倍三角形”
(2)若Rt△ABC是“方倍三角形”,且斜边AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)如图,△ABC中,∠ABC=120°,∠ACB=45°,P为AC边上一点,将△ABP沿直线BP进行折叠,点A落在点D处,连接CD,AD.若△ABD为“方倍三角形”,且AP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/47d8de30-7901-47f4-bb0e-2214b2e9e596.jpg?resizew=126)
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【推荐2】欧几里德,古希腊著名数学家.被称为“几何之父”.他最著名的著作《几何原本》是欧洲数学的基础,总结了平面几何五大公设,被广泛地认为是历史上最成功的教科书.他在第三卷中提出这样一个命题:“由已知点作直线切于已知圆”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/a32b331c-a842-4c5e-9c9c-1d652214d088.png?resizew=377)
如图1,设点
是已知点,圆
是已知圆,对于上述命题,我们可以进行如下尺规作图:
①连接
,作线段
的中点
;
②以
为圆心,以
为半径作圆
,与圆
交于两点
和
;
③连接
、
,则
、
是圆
的切线.
(1)按照上述作图步骤在图1中补全图形;
(2)为了说明上述作图的正确性,需要对其证明,请写出证明“
、
是圆
的切线”的过程;
(3)如图2,连接
并延长交圆
于点
,连接
,已知
,
,求圆
的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/a32b331c-a842-4c5e-9c9c-1d652214d088.png?resizew=377)
如图1,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
②以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)按照上述作图步骤在图1中补全图形;
(2)为了说明上述作图的正确性,需要对其证明,请写出证明“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815d1ce1ba84bac399c8b20e074cf045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3bd41676f6b69acac00a292fe134cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1894806f9e88719659fa24291743068e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fa523cd9205bdfa2ce0e298f26c18d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】如图,等腰三角形
的底边
,高
,
是
的中点,连接
.动点
从点
出发,以每秒1个单位长度的速度沿
向点
运动,到点
停止;另一动点
从点
出发,以相同的速度沿
运动,到点
停止,已知点
比点
早出发1秒.当点
出发后,以
为边作正方形
,使点
和点
在
的同侧,设点
运动的时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/03fe41fc-2c3e-490c-97e9-4cd51ade2aff.png?resizew=404)
(1)当
时,用含
的代数式表示
的长;
(2)当正方形
的对称中心在
的边上时,求
的值;
(3)在点
出发的同时,点
从点
出发,以每秒
个单位长度的速度沿折线段
运动,回到点
时停止.
①点
在水平方向上的运动速度是每秒_______________个单位长度;
②在点
的整个运动过程中,直接写出点
在正方形
内(含边界)的时长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/03fe41fc-2c3e-490c-97e9-4cd51ade2aff.png?resizew=404)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18419ab2d7cde42b1130e9894dc5b9e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7c78fdbfa36b9d6151bf993e0e8b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②在点
![](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/611f100dcfa7803db6eb233e2e7f2dab.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,在正方形
中,
,E是对角线
上的点,连接
,过点E作
,交
于点F,连接
交
于点G.
![](https://img.xkw.com/dksih/QBM/2023/4/15/3217051055300608/3218351709216768/STEM/55cc5f20e1464889808ff20a082c37ed.png?resizew=144)
(1)求证:
;
(2)若
,则
___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.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/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2023/4/15/3217051055300608/3218351709216768/STEM/55cc5f20e1464889808ff20a082c37ed.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03ed1993251653c808e7293a9d1b4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b644e2bc1df31ac474d646b1d1319400.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知,四边形ABCD是正方形,点G是直线BC上的任意一点,DE⊥AG于点E,BF∥DE,交AG于F.
(1)如图1,当点G在线段BC上时,求证:DE﹣BF=EF;
[拓展延伸]
(2)如图2,当点G在线段CB的延长线上时,线段DE、BF、EF之间存在怎样的数量关系?并说明理由.
(3)如图3,在(2)的条件下,连接AC,过F作FH∥GC,交AC于点H,连接DH,若∠ADE=30°,GB
,求DH的长.
(1)如图1,当点G在线段BC上时,求证:DE﹣BF=EF;
[拓展延伸]
(2)如图2,当点G在线段CB的延长线上时,线段DE、BF、EF之间存在怎样的数量关系?并说明理由.
(3)如图3,在(2)的条件下,连接AC,过F作FH∥GC,交AC于点H,连接DH,若∠ADE=30°,GB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59ac3a4a693a7459d11fb8f7ed12977.png)
您最近一年使用:0次