如图,在平行四边形
中,对角线
的垂直平分线分别与
,
,
相交于点
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/1f56552f-7abb-40b9-a63e-0def5de488e8.png?resizew=266)
(1)求证:四边形
是菱形;
(2)若
,
,且
,求
.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/1f56552f-7abb-40b9-a63e-0def5de488e8.png?resizew=266)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2af439304fcef24d29b40ef3366b25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17ab827a102c719441560431222a50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6beb17d468d0e90f9c08a8dbbc05541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
更新时间:2023-11-25 15:55:07
|
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解答题-问答题
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适中
(0.65)
【推荐1】已知:如图,在Rt△ABC中,∠ACB=90°,BC=12,cosB=
,D、E分别是AB、BC边上的中点,AE与CD相交于点G.
(1)求CG的长;
(2)求tan∠BAE的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(1)求CG的长;
(2)求tan∠BAE的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/117361f8-1bb2-4a51-b0e3-b9a1d7b63d0a.png?resizew=194)
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解题方法
【推荐2】如图,在正方形
中,M、N分别是射线
和射线
上的动点,且始终
.
、
上时,请直接写出线段
、
、
之间的数量关系;
(2)如图2,当点M、N分别在
、
的延长线上时,(1)中的结论是否仍然成立,若成立,给予证明,若不成立,写出正确的结论,并证明;
(3)如图3,当点M、N分别在
、
的延长线上时,若
,设
与
的延长线交于点P,交
于Q,直接写出
、
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4794cf7c57bdd4825d9e6615e2527a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
(2)如图2,当点M、N分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(3)如图3,当点M、N分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7135c43a297bf07cabd4f4d4b585cf3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐1】已知
中,
,
,点
从点
出发,沿
方向以每秒
的速度向终点
运动,同时动点
从点
出发沿
方向以每秒
的速度向终点
运动,设运动的时间为
秒.
(1)如图①,若
,求
的值;
(2)如图②,将
沿
翻折至
,当
为何值时,四边形
为菱形?
![](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/67e23f5d5fc7e2edaee3a7d23d413368.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c62311b6f413f8f80ea501ee299524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/1ec229bb-f7b5-4154-9a4d-d550324385de.png?resizew=317)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f24325565a9dd95128a633a240da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)如图②,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51ece6bb53c3f5bf2da7d9ee5960e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49609b4d9e82bcea90e1c5658734f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5522429a04d25fe75846fd73408c79.png)
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解答题-证明题
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【推荐2】如图,已知在四边形ABCD中,AD
BC,AB=BC,对角线AC,BD交于点O,且OA=OC,过点D作DE⊥BC,交BC的延长线于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/8b85cde4-8c4f-4405-8083-24230ebe9c7a.png?resizew=155)
(1)求证:OD=OB;
(2)求证:四边形ABCD是菱形;
(3)若sin∠CDE=
,CE=1,求BD的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/8b85cde4-8c4f-4405-8083-24230ebe9c7a.png?resizew=155)
(1)求证:OD=OB;
(2)求证:四边形ABCD是菱形;
(3)若sin∠CDE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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解答题-问答题
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【推荐1】等腰直角三角形ABC中,∠BAC=90°,BC=12,点M为BC中点,含45°的直角三角板的锐角顶点与M重合,当三角板绕点M旋转时,三角板与两直角边交于点P、Q.P、Q分别在AB、AC边上,设BP=x,CQ=y.
(1)求y与x的函数关系式;
(2)写出x的取值范围.
(1)求y与x的函数关系式;
(2)写出x的取值范围.
![](https://img.xkw.com/dksih/QBM/2018/12/27/2105768692940800/2109943643717632/STEM/1c6f1061291542b0bd27dd16c0c22102.png?resizew=160)
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解答题-证明题
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适中
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【推荐2】如图,在
中,
,E点在AB边上,D点在BC边上,以AE为直径的
过D点,与AC边相交于点F,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/ea6591e9-3a71-4b61-b65a-cfb5351eb7bb.png?resizew=154)
(1)求证:BC是
的切线;
(2)若
,
的半径为6,求BE和CF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/ea6591e9-3a71-4b61-b65a-cfb5351eb7bb.png?resizew=154)
(1)求证:BC是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f0ff5c812e3be810252dc188beb603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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