如图,在矩形
中,
,点
从点
出发向点
运动,运动到点
停止,同时,点
从点
出发向点
运动,运动到点
即停止,点
的速度都是每秒1个单位,连接
.设点
运动的时间为
秒
为何值时,四边形
是矩形;
(2)当
时,判断四边形
的形状,并说明理由;
(3)当
为何值时,
;
(4)整个运动当中,直接写出线段
扫过的面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631b5a76fbe4e117bd1005beb99b76e.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e235c33bdfc7335f75e00f9a463cf297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe83f1ae7e5f05d8bed6bf6f42db0e7d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56bb615b68fdd6edfe77c246e81702a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9af2350fad62b04e28e710045b513c.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aad564239fcfe92cfba8fb6ba758af5.png)
(4)整个运动当中,直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
更新时间:2024-05-06 07:55:55
|
相似题推荐
解答题-作图题
|
较难
(0.4)
名校
【推荐1】定义:有一组对角是直角的四边形叫做“准矩形”;有两组邻边(不重复)相等的四边形叫做“准菱形”.如图①,在四边形ABCD中,若∠A=∠C=90°,则四边形ABCD是“准矩形”;如图②,在四边形ABCD中,若AB=AD,BC=DC,则四边形ABCD是“准菱形”.
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466210493464576/2467367062355968/STEM/5b00ac8e-023e-49c6-9b99-225431c59c63.png?resizew=404)
(1)如图,在边长为1的正方形网格中,A、B、C在格点(小正方形的顶点)上,请分别在图③、图④中画出“准矩形”ABCD和“准菱形”ABCD′.(要求:D、D′在格点上);
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466210493464576/2467367062355968/STEM/6dd12ea9-030c-4ea0-beb6-3a28d1a8e53e.png?resizew=421)
(2)下列说法正确的有 ;(填写所有正确结论的序号)
①一组对边平行的“准矩形”是矩形;②一组对边相等的“准矩形”是矩形;
③一组对边相等的“准菱形”是菱形;④一组对边平行的“准菱形”是菱形.
(3)如图⑤,在△ABC中,∠ABC=90°,以AC为一边向外作“准菱形”ACEF,且AC=EC,AF=EF,AE、CF交于点D.
①若∠ACE=∠AFE,求证:“准菱形”ACEF是菱形;
②在①的条件下,连接BD,若BD=
,∠ACB=15°,∠ACD=30°,请直接写出四边形ACEF的面积.
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466210493464576/2467367062355968/STEM/5b00ac8e-023e-49c6-9b99-225431c59c63.png?resizew=404)
(1)如图,在边长为1的正方形网格中,A、B、C在格点(小正方形的顶点)上,请分别在图③、图④中画出“准矩形”ABCD和“准菱形”ABCD′.(要求:D、D′在格点上);
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466210493464576/2467367062355968/STEM/6dd12ea9-030c-4ea0-beb6-3a28d1a8e53e.png?resizew=421)
(2)下列说法正确的有 ;(填写所有正确结论的序号)
①一组对边平行的“准矩形”是矩形;②一组对边相等的“准矩形”是矩形;
③一组对边相等的“准菱形”是菱形;④一组对边平行的“准菱形”是菱形.
(3)如图⑤,在△ABC中,∠ABC=90°,以AC为一边向外作“准菱形”ACEF,且AC=EC,AF=EF,AE、CF交于点D.
①若∠ACE=∠AFE,求证:“准菱形”ACEF是菱形;
②在①的条件下,连接BD,若BD=
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466210493464576/2467367062355968/STEM/f13a21b1e451489698c3e72b915a1017.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466210493464576/2467367062355968/STEM/62dcce38-ef6f-4468-846b-a89512cdcc7d.png?resizew=140)
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解答题-证明题
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【推荐2】如图,在
的边
上取一点
,以
为圆心,
为半径画
,
与边
相切于点
,
,连接
交
于点
,连接
,并延长交线段
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/725f946d-a80f-4019-a8b5-ad29a8ac5137.png?resizew=217)
(1)求证:
是
的切线;
(2)若
,
,求
的半径;
(3)若
是
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/725f946d-a80f-4019-a8b5-ad29a8ac5137.png?resizew=217)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e071479287e774f7f0990b1a649658f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31ff5234f34c4d25772351c7b5e86b0.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图,在
中,
,
,
.
平分
,交
于点
.动点
从点
出发,按
的折线路径运动,动点
在边
上的运动速度为每秒1个单位长度,在边
上的运动速度为每秒2个单位长度,设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/8d5a10ab-c55f-453e-ba2f-063a3110f498.png?resizew=254)
(1)当点
在
边上运动时,线段
的长为________(用含
的代数式表示);
(2)设
的面积为
,请用含
的代数式表示
.
(3)当
为轴对称图形时,请直接写出满足条件的
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e8503959de9bcffd08d7da0ffea8a0.png)
![](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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/8d5a10ab-c55f-453e-ba2f-063a3110f498.png?resizew=254)
(1)当点
![](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/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41984f53bb280ba8b5ac00a52ce2825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-作图题
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较难
(0.4)
名校
【推荐2】已知,如图,在正方形
中,点P在射线
上,连接
,
,M、N分别为
、
中点,连接
交
于点Q.
的度数;
(2)当点P在线段
的延长线上时,
①依题意补全图2;
②在点P运动过程中,请你对线段
与
的数量关系进行猜想,并说明理由.
(3)若过点B作直线
的垂线交其于点H,连接
,若
,请直接写出线段
长度的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5079610ed3d70bee69791c200c7a2a19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b3c43535124172172ee3538bc8e05a.png)
(2)当点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①依题意补全图2;
②在点P运动过程中,请你对线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6927cc2a930203ac34366383e76ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
(3)若过点B作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
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解答题-问答题
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较难
(0.4)
名校
【推荐1】矩形
中,
、
交于点O,
(k为常数).作
,
、
分别与
、
边相交于点E、F,连接
,
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957150434394112/2961045936594944/STEM/f21a1772-136f-48a5-bee9-a6af863fc95d.png?resizew=498)
(1)发现问题:如图1,若
,猜想:
______;
(2)类比探究:如图2,
,探究线段
,
之间的数量关系,并说明理由;
(3)拓展运用:如图3,在(2)的条件下,若
,
,
,求
的长.
![](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/57fdde5c60611ad99eac513a724492da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319ff9f648fedec284a11a9761cb6183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957150434394112/2961045936594944/STEM/f21a1772-136f-48a5-bee9-a6af863fc95d.png?resizew=498)
(1)发现问题:如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296e84ad7592188c975912ba17af0ee3.png)
(2)类比探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(3)拓展运用:如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb6abd4e67785049f8ea82d2309f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e26838e7dbb6febf2fc04db05893a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ef25427331ab3c7190da269561a56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,
,
,点B在x轴的正半轴上,且AB=4,连接AC交y轴于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/4899477e-9ac5-4367-a3a2-be3e147d02c5.png?resizew=234)
(1)求点B与点D的坐标;
(2)在y轴上是否存在点P,使得△ACP的面积与△ABC的面积相等?若存在,请求出点P的坐标;若不存在,请说明理由;
(3)若点Q的纵坐标为5,且△QBC面积为20,请求出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c2df1ec4f5d17fa8590e920fac61af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/4899477e-9ac5-4367-a3a2-be3e147d02c5.png?resizew=234)
(1)求点B与点D的坐标;
(2)在y轴上是否存在点P,使得△ACP的面积与△ABC的面积相等?若存在,请求出点P的坐标;若不存在,请说明理由;
(3)若点Q的纵坐标为5,且△QBC面积为20,请求出点Q的坐标.
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐1】如图,在
中,以点
为圆心,
长为半径画弧交
于点
;再分别以点B、F为圆心,大于
的相同长为半径画弧,两弧交于点
;连接
并延长交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/73ec6c53-133f-40f1-a894-4e973951be53.png?resizew=233)
(1)根据以上尺规作图的过程,求证四边形
是菱形;
(2)若菱形
的周长为16,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe477aea662f3ae9b6d28f1e785147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.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/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/73ec6c53-133f-40f1-a894-4e973951be53.png?resizew=233)
(1)根据以上尺规作图的过程,求证四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
(2)若菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee66d4667c62551ce2e6250a9612864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在△ABC中,AE是∠BAC的平分线,与BC交于点E,D是边AC上一点,且AB=AD,DF
BC,与AE交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/3de47380-4849-4e94-b9ab-34a0b44c0ba6.png?resizew=171)
(1)求证:四边形BEDF是菱形;
(2)若D是AC的中点,当△DEC是直角三角形时,则
的值为_____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/3de47380-4849-4e94-b9ab-34a0b44c0ba6.png?resizew=171)
(1)求证:四边形BEDF是菱形;
(2)若D是AC的中点,当△DEC是直角三角形时,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f276ad76c075f4be32ad326d223cf3.png)
您最近一年使用:0次