如图,在
中,
是它的一条对角线.
;
(2)尺规作图:作
的垂直平分线
,分别交
,
于点E,F(不写作法,保留作图痕迹);
(3)连结
,若
,求
的大小.
![](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/aabbddb447b1889c86646b7bbf197216.png)
(2)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcab066fee173cf267bfb5fa5c824ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
更新时间:2024-05-23 10:38:34
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相似题推荐
解答题-证明题
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名校
【推荐1】如图,四边形 ABCD 和四边形 AEFB 都是平行四边形, 求证:△ADE≌△BCF.
![](https://img.xkw.com/dksih/QBM/2019/8/2/2260317420445696/2286273901051904/STEM/09bf528656334920933bece2ae37af21.png?resizew=146)
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【推荐2】如图,已知:PA=PB,AC=BD,PC=PD,△PAD和△PBC全等吗?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/24abe24c-5a68-4d2d-a337-23eea5300593.png?resizew=116)
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【推荐1】如图所示,
是
的角平分线,
是
的垂直平分线,交
的延长线于点F,连结
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fadd750230155d68e24ff3e3732cddda.png)
![](https://img.xkw.com/dksih/QBM/2021/9/22/2813519557754880/2813788150095872/STEM/9382504f-dc62-433f-aa98-4e3d22dde155.png)
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【推荐2】[问题初探]
在数学活动课上,李老师给出如下问题;如图1,在
中,
,
,垂足为B,且
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12d11c9caa2d667a93a71ea31742161.png)
①如图2小鹏同学从结论的角度出发给出如下解题思路;在
上截取
连接
,将线段
与
,
之间的数量关系转化为
与
之间的数量关系。
②如图3,小亮同学从
这个条件出发给另一种解题思路:作
的垂直平分线,分别与
,
交于F,E两点,连接
,将
转化为
与
之间的数量关系, 请你选择一名同学的解题思路,写出证明过程
[类比分析]
李老师发现之前两名同学都运用了转化思想,将证明三条线段的关系转化为证明两条线段的关系;为了帮助学生更好地感悟转化思想,李老师将图1进行变换并提出了下面问题,请你解答.
如图4,在
中,
,过点A作
(点D与点C在
同侧),若
,求证;
.
在数学活动课上,李老师给出如下问题;如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca15680465a77c5ce6543766f583ceaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e146bbc92ff020681460bd252b6d33c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12d11c9caa2d667a93a71ea31742161.png)
①如图2小鹏同学从结论的角度出发给出如下解题思路;在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ac49caae8e3b8869d19beeff98966e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
②如图3,小亮同学从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca15680465a77c5ce6543766f583ceaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/ca15680465a77c5ce6543766f583ceaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9940b7a52cfb34f91389c8adac6b69e.png)
[类比分析]
李老师发现之前两名同学都运用了转化思想,将证明三条线段的关系转化为证明两条线段的关系;为了帮助学生更好地感悟转化思想,李老师将图1进行变换并提出了下面问题,请你解答.
如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7a1d7dead053c838decaf271354b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12d11c9caa2d667a93a71ea31742161.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/ac1a0a75-6998-4c9d-985a-c45e557bb8cb.png?resizew=582)
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解答题-作图题
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【推荐1】(2017湖北孝感第20题)如图,已知矩形
.
(1)请用直尺和圆规按下列步骤作图,保留作图痕迹:
①以点
为圆心,以
的长为半径画弧交边
于点
,连接
;
②作
的平分线交
于点
;
③连接
;
(2)在(1)作出的图形中,若
,则
的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99cc21cc15b1744f779ecc05aaad162e.png)
(1)请用直尺和圆规按下列步骤作图,保留作图痕迹:
①以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)在(1)作出的图形中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1cec6ba1368cb4afd4fe20fcd721975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4039762c2e2a8f6b2115eeedb34d50c1.png)
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876496841162752/1887981062873088/STEM/b969c3d8c30b41458e0ef4391fdeebac.png?resizew=183)
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【推荐2】如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/962731ff-997f-49f4-986f-b6ed14350ae0.png?resizew=182)
(1)用尺规作图过点A作
的垂线,交
的延长线于点E.(保留作图痕迹,不要求写作法)
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f130656d081a0613e2865610d16ee9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/962731ff-997f-49f4-986f-b6ed14350ae0.png?resizew=182)
(1)用尺规作图过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
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【推荐1】如图,在等边三角形
中,边长为
,点
为
中点,点
从点
出发,沿
方向匀速运动,速度是
;同时点
由
点出发,沿
方向匀速运动,速度为
,过点
的直线
,交
于点
,设运动时间为
(
)(
),解答下列问题:
为何值时,
?
(2)在整个运动过程中,是否存在某一时刻
,使得以
,
,
,
为顶点的四边形是平行四边形?若存在,求出
的值;若不存在,求出
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689ff84e2d7f52c7446ef789a54557da.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79789686104cab147c239d152271e076.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d927e9b22848c8e7a8a497870daaeb.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://staticzujuan.xkw.com/quesimg/Upload/formula/c8c1468cf3bc2bbc5bee776b882f42eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0fed6f944ef4b07f7e33ca893581fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b154270249b0ef54ddb26137b2681a.png)
(2)在整个运动过程中,是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-作图题
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适中
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【推荐2】请完成以下作图和填空:如图,在平行四边形
中,
于点
.
交
延长线于点
.(保留作图痕迹,不写作法)
(2)若
,求证:平行四边形
为菱形.
请将下面的证明过程补充完整.
证明:
四边形
是平行四边形,
① ,
,
,
,
② .
在
与
中:
,
.
③ ,
平行四边形
是菱形( ④ ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbee06d305abf6692125513dc3757f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e46fb91464159b80eab7c28a926b4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
请将下面的证明过程补充完整.
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2505945d3998bf1a392bcb0d4655e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb99b9e958d06554e5877f3d105c1ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbee06d305abf6692125513dc3757f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79c5041878c15de69253ca11a03ab1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb108a06636296621cbf615327ea4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ad3fa067373e347df60571e78f0f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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