教材中有这样一道题:如图①所示,四边形
是正方形,G是
上的任意一点,
于点E,
,且交
于点F.求证:
.
小明通过证明
解决了问题,在此基础上他进一步提出了以下问题,请你解答.
(1)若图①中的点G为
延长线上一点,其余条件不变,如图②所示,猜想此时
之间的数量关系,并证明你的结论;
(2)将图①中的
绕点A逆时针旋转,使得
与
重合,记此时点F的对应点为点
,如图③所示,若正方形的边长为6,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd99874843902d155f3f9dc26b924f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daee8baa62b5b8d5db41eab0d360ee51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0a32a119ffb52f3d288071c3e94d58.png)
小明通过证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6289f82472eec6b8c47b883a55f9ec32.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/7b063180-fbd9-478c-b302-956b08139e2b.png?resizew=462)
(1)若图①中的点G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f90f69d449e48719948ba60c9e04a8d.png)
(2)将图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3184cd468586362043f15d3964991725.png)
更新时间:2024-03-02 15:43:02
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相似题推荐
解答题-证明题
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【推荐1】在△ABC中,AC>BC,D为AB的中点,E为线段AC上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/b4173689-5add-4e57-8bdf-2816ff440e2e.png?resizew=340)
(1)如图1,若AE=
AC,∠C=90°,BC=2,AC=4,求DE的长;
(2)如图2,若AE=BC且F为EC中点,求证:∠AFD=
∠C;
(3)若2∠AED-∠C=180°,试探究AE、BC、AC的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/b4173689-5add-4e57-8bdf-2816ff440e2e.png?resizew=340)
(1)如图1,若AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af46237d7279ffb682d57e4e7b57a2b.png)
(2)如图2,若AE=BC且F为EC中点,求证:∠AFD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
(3)若2∠AED-∠C=180°,试探究AE、BC、AC的数量关系,并证明.
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【推荐2】如图,在△ABC中,BC>AC,点E在BC上,CE=CA,点D在AB上,连接DE,∠ACB+∠ADE=180°,作CH⊥AB,垂足为H.
(1)如图a,当∠ACB=90°时,连接CD,过点C作CF⊥CD交BA的延长线于点F.
①求证:FA=DE;
②请猜想三条线段DE,AD,CH之间的数量关系,直接写出结论;
(2)如图b,当∠ACB=120°时,三条线段DE,AD,CH之间存在怎样的数量关系?请证明你的结论.
(1)如图a,当∠ACB=90°时,连接CD,过点C作CF⊥CD交BA的延长线于点F.
①求证:FA=DE;
②请猜想三条线段DE,AD,CH之间的数量关系,直接写出结论;
(2)如图b,当∠ACB=120°时,三条线段DE,AD,CH之间存在怎样的数量关系?请证明你的结论.
![](https://img.xkw.com/dksih/QBM/2016/10/13/1574247776043008/1574247782301696/STEM/3e13b090eccd4c4d9402386e77da1b64.png?resizew=388)
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【推荐1】(1)数学张老师在数学活动课上出示了一道探究题:
如图,在
和
中,
,
,B,C,E三点在同一直线上,A,D两点在
同侧,若
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/5da10a09-8dec-4d19-97f5-ee3272ef8f3b.png?resizew=123)
张老师分别从问题的条件和结论出发分析这道探究题:
①如图1,从条件出发:过A作
交
于M,过D作
交
于N,依据等腰三角形的性质“三线合一”分析
与
之间的关系,可证得结论;
②如图2,从结论出发:过D作
交
于P,依据三角形全等的判定,证明
,可证得结论;
请你运用其中一种方法,解决上述问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/ea08232f-5ac8-4776-a027-7d57c8b28ee8.png?resizew=286)
(2)小明同学经过对探究题及张老师分析方法的思考,提出以下问题:
如图3,在
中,
,在
中,
,B,C,E三点在同一直线上,A,D两点在
同侧,且A,D,E三点在同一直线上,若
,
,
的面积为7,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/91f1f89b-9a89-4389-a20e-8a241e45a97e.png?resizew=118)
(3)在小明同学的问题得到解决后,张老师针对之前的解题思路提出了下面问题:
如图4,在四边形
中,
,
,点E为
中点,连接
,若
,
,
,求
的长.
如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904a9c8e1e111a74eab5818919191ecb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/5da10a09-8dec-4d19-97f5-ee3272ef8f3b.png?resizew=123)
张老师分别从问题的条件和结论出发分析这道探究题:
①如图1,从条件出发:过A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7e284eac4b90bfb327de768a7beef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b9f8078689173b9588d16e4b65b9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
②如图2,从结论出发:过D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844230a06538f3da2f51d8a5cadca06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542f98377e2805f5cbf7b4bf40c1623f.png)
请你运用其中一种方法,解决上述问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/ea08232f-5ac8-4776-a027-7d57c8b28ee8.png?resizew=286)
(2)小明同学经过对探究题及张老师分析方法的思考,提出以下问题:
如图3,在
![](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/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65ed8e87249d3c5b9f30a89f5ded4a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0488d2f939ae98e8d4a51e37b91cc062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/91f1f89b-9a89-4389-a20e-8a241e45a97e.png?resizew=118)
(3)在小明同学的问题得到解决后,张老师针对之前的解题思路提出了下面问题:
如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a755edadca4e4fc27fd49559b8d691ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59f5c3923354587bf3b08d0538af208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf7c22116e6736e295d8d7eef9f5471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2961c2afded1adb0e7a77c65cba0a2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/56d5f61b-f502-43c4-8a1b-b002660f10cc.png?resizew=187)
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【推荐2】请阅读下列材料,并完成相应的任务:
三角形中线定理
三角形中线定理又称阿波罗尼奥斯定理,是一种平面几何的定理之一,指三角形三边和中线长度关系.
阿波罗尼奥斯(约公元前262-190年),古希腊数学家,与欧几里得、阿基米德合称为古希腊亚历山大前期的三大数学家.
中线定理:三角形两边的平方和等于第三边的一半与第三边上的中线的平方和的两倍.如图1,在
中,点D为BC的中点,根据“阿波罗尼奥斯”,可得
.下面是该定理的证明过程(部分):
证明:过点A作
于点E,如图2,在
中,
,
同理可得:
,
,
证明的方便,不妨设
,
,
…
(1)按照上面的证明思路,完成该定理证明的剩余部分;
(2)如图3,在
中,点
为
的中点,
,
,
,则
的长为______;
(3)如图4,已知平行四边形
中,
和
相交于点
,设
,
,请直接用含
,
的代数式表示
的值;
(4)如图5,已知平行四边形
内接于
,点
为
内一点,若
,
,
,
,请直接写出
的长.
三角形中线定理
三角形中线定理又称阿波罗尼奥斯定理,是一种平面几何的定理之一,指三角形三边和中线长度关系.
阿波罗尼奥斯(约公元前262-190年),古希腊数学家,与欧几里得、阿基米德合称为古希腊亚历山大前期的三大数学家.
中线定理:三角形两边的平方和等于第三边的一半与第三边上的中线的平方和的两倍.如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51056472e8bc2ac5deb51b218b8e8dfd.png)
证明:过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a3b94566843e92ce775ff6bdf386fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4ac0d942636f956146beb37e61ecbf.png)
同理可得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001e843fcc05f3e39aeea1e407f7630c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84bc23a1ff4ecafd57913425a1f1c14f.png)
证明的方便,不妨设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d6ee95e7130903b3a30b3bca0273c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d70e5d13db498f1c8a2e017c56e58b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d86df01263b3dd6120b5b034770cecd.png)
(1)按照上面的证明思路,完成该定理证明的剩余部分;
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
(3)如图4,已知平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3d296e0d7154a170cb7d3ae42989b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc490fd9c850622aa2beaf5d38d46459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0a77c98c0a179b8805828d22fe5d8d.png)
(4)如图5,已知平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591fba92a0da76c9da8a0a45a629bb10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0101a7b5c8a4aed0de2af363792e39a1.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】已知四边形
是正方形,
是等腰直角三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/8c620760-4f2b-4705-b1f8-f07d34cbaf3d.png?resizew=415)
(1)如图
,当
分别在边
上,线段
与
的关系是______;
(2)如图
,当
绕点
逆时针旋转
(
)时,试判断(
)中线段
与
的关系是否仍然成立,请利用图
给予证明;
(3)如图
,当
绕点
逆时针旋转
时,延长
交
于点
,交
于点
,
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/8c620760-4f2b-4705-b1f8-f07d34cbaf3d.png?resizew=415)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137717f0e360e82319ced7e3a6c69b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd51383f8f047f565191b128cec637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】某数学兴趣小组在数学课外活动中,对多边形内两条互相垂直的线段做了如下探究:
【观察与猜想】(1)如图 1,在正方形
中,点 E、 F分别是
、
上的两点,连接
、
,
,则
的值为 ;
【类比探究】(2)如图 2 ,在矩形
中,
,点 E是
上的一点,连接
、
,且
,求
的值;
【拓展延伸】(3)如图3,在四边形
中,
,
,
,点E为
上一点,连接
,过点 C作
的垂线交
的延长线于点 G,交
的延长线于点 F,求
的值;
【观察与猜想】(1)如图 1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
【类比探究】(2)如图 2 ,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1983c41ebdacc818687e43642f8fb670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
【拓展延伸】(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6341460754c235399e43a663404a8dba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8a8257c3e0ee20cd4626656af4af91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图,在Rt△ABC中,∠BAC=90°,AB=AC,D是BC边上一动点.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2940856386977792/2957285985861632/STEM/5730893e-bbfd-4e3f-bacf-67de4b54d6b6.png?resizew=496)
(1)如图①,若BC=
,∠CAD=15°,求BD的长;
(2)如图②,D是BC边的中点,E是BA延长线上一点,连接CE,过点A作AF⊥CE于点F,过点B作BG⊥AF交FA延长线于点G,连接DG.请猜想BG、CF、DG的关系,并证明你的结论;
(3)如图③,若AB=
,M是△ABC内部一点,当CM+AM+
BM取得最小值时,请直接写出△ABM的面积.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2940856386977792/2957285985861632/STEM/5730893e-bbfd-4e3f-bacf-67de4b54d6b6.png?resizew=496)
(1)如图①,若BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
(2)如图②,D是BC边的中点,E是BA延长线上一点,连接CE,过点A作AF⊥CE于点F,过点B作BG⊥AF交FA延长线于点G,连接DG.请猜想BG、CF、DG的关系,并证明你的结论;
(3)如图③,若AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】正方形ABCD中,点P为直线AB上一个动点(不与点A,B重合),连接DP,将DP绕点P旋转90°得到EP,连接DE,过点E作CD的垂线,交射线DC于M,交射线AB于N.
问题出现:(1)当点P在线段AB上时,如图1,线段AD,AP,DM之间的数量关系为 ;
题探究:(2)①当点P在线段BA的延长线上时,如图2,线段AD,AP,DM之间的数量关系为 ;
②当点P在线段AB的延长线上时,如图3,请写出线段AD,AP,DM之间的数量关系并证明;
问题拓展:(3)在(1)(2)的条件下,若AP=
,∠DEM=15
°,则DM= .
问题出现:(1)当点P在线段AB上时,如图1,线段AD,AP,DM之间的数量关系为 ;
题探究:(2)①当点P在线段BA的延长线上时,如图2,线段AD,AP,DM之间的数量关系为 ;
②当点P在线段AB的延长线上时,如图3,请写出线段AD,AP,DM之间的数量关系并证明;
问题拓展:(3)在(1)(2)的条件下,若AP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2018/11/3/2067828548255744/2069768381128704/STEM/212fac68c5734a1aa5f3e318434032bb.png?resizew=5)
![](https://img.xkw.com/dksih/QBM/2018/11/3/2067828548255744/2069768381128704/STEM/06b32c65729b4d90879857224025fc78.png?resizew=415)
您最近一年使用:0次