如图,正方形
中,边长为4,
为
的中点,
为正方形内部一点,连结
、
,若
平分
且
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/71755ecf-0c8b-45a8-beca-d3ba9f7825b3.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7316430d26a6f4bcc0bdadfd1a5330a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3cd8fbcd9eb594adb8367795d444d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/71755ecf-0c8b-45a8-beca-d3ba9f7825b3.png?resizew=123)
A.![]() | B.![]() | C.![]() | D.2 |
更新时间:2024-02-20 18:04:24
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【推荐1】如图,在正方形
中,
是
边上一点,连接
,以
为斜边作等腰直角
.有下列四个结论:①
;②点
在线段
上;③当
时,
平分
;④若点
在
上以一定的速度由
向
运动,则点
的运动速度是点
运动速度的2倍.其中正确的结论的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db5739574557d33d313484f295bd2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8609258652778f3b498e16f25b53cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
A.1 | B.2 | C.3 | D.4 |
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【推荐2】已知:如图,正方形ABCD中,AB=2,AC,BD相交于点O,E,F分别为边BC,CD上的动点(点E,F不与线段BC,CD的端点重合)且BE=CF,连接OE,OF,EF.在点E,F运动的过程中,有下列四个结论:
②△OEF面积的最小值是
;
③至少存在一个△ECF,使得△ECF的周长是
;
④四边形OECF的面积是1.
所有正确结论的序号是( )
②△OEF面积的最小值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
③至少存在一个△ECF,使得△ECF的周长是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce55e24888ed0b23d54e44ee055cf74.png)
④四边形OECF的面积是1.
所有正确结论的序号是( )
A.①②③ | B.③④ | C.①②④ | D.①②③④ |
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【推荐1】如图,在平面直角坐标系中,
在第一象限内,边
与
轴平行,点
,
均在函数
的图象上.若
,
两点的纵坐标分别为
,
,且
,
的面积为
,则
值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/938a83f9-fcc1-4596-b76f-8f94216763cd.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03517310ea1e913f709753592ac65ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d2d267caf23c33bf34f6e2764ada9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/938a83f9-fcc1-4596-b76f-8f94216763cd.png?resizew=136)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在平行四边形
中,
,M是边
的中点,N是边
上的动点,将
沿
所在的直线翻折得到
,连接
.对于结论I、Ⅱ,下列判断正确的是( )
结论I:当
时,四边形
是菱形;
结论Ⅱ:当点
在线段
上时,
的长度为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d48472b00ec6632c1f236045143060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d85ae379f8be9a204cff7c80d10ccdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7f58eeb3fb122d2b8ebe6b2b44acdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c41e4915ba9901eea70770edf03b9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/8097c5e9-c842-4607-89d8-451a8c3e2a0f.png?resizew=200)
结论I:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c95bc9cbaa7a9b4bb539b0ff33ed932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c637e8c81ec43e548a129727d9a8a2f8.png)
结论Ⅱ:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8396a7120abeaae6236a9292e5b9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c41e4915ba9901eea70770edf03b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d48472b00ec6632c1f236045143060.png)
A.I对Ⅱ不对 | B.I不对Ⅱ对 | C.I、Ⅱ都不对 | D.I、Ⅱ都对 |
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【推荐1】如图,在正方形ABCD的对角线AC上取一点E.使得
,连接BE并延长BE到F,使
,BF与CD相交于点H,若
,有下列结论:①
;②
;③四边形ABED的面积是
,④
.则其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2022/7/8/3018226399453184/3051234040709120/STEM/a509b8f876b34982a562a6230b7d8bfe.png?resizew=201)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c239a56587c675b532347546b48ea09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3b0b5010813ccc388a41ba74f3b932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd0f3bf744916e576506127d6570018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a2d014899fa3341b58348530f3d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb03865bc5bbd5acdf68260d6a1454f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1516e391f098635b2ded39c0dc1250bf.png)
![](https://img.xkw.com/dksih/QBM/2022/7/8/3018226399453184/3051234040709120/STEM/a509b8f876b34982a562a6230b7d8bfe.png?resizew=201)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,点E是边长为8的正方形ABCD的边CD上一动点,连接AE,将线段AE绕点E逆时针旋转90°到线段EF,连接AF,BF,AF交边BC于点G,连接EG,当AF+BF取最小值时,线段EG的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/5adbfa53-c683-40dd-9f99-7e01ac650b10.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/5adbfa53-c683-40dd-9f99-7e01ac650b10.png?resizew=148)
A.8![]() | B.7 | C.9 | D.![]() |
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【推荐1】如图,在△ABC中BC<AC,∠A+∠C=60°,点D在BC上,点E在AC上,连接DE,∠ABC=∠DEC,过点B作BF⊥AC于点F.若DB=AB,则
的值为( )
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae9da6f83c6fd6b062893b2a86755aa.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
A.1 | B.2 | C.![]() | D.![]() |
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【推荐2】如图,在菱形ABCD中,AB=6,∠DAB=60°,AE分别交BC、BD于点E、F,CE=2,连接CF,以下结论:①△ABF≌△CBF;②点E到AB的距离是2
;③tan∠DCF=
;④△ABF的面积为
.其中一定成立的有几个( )
![](https://img.xkw.com/dksih/QBM/2018/7/15/1988821410856960/1990480303570944/STEM/fbabac9d95d34fc688b3bab46ace6219.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd6160ab7a53bc6b98193efb01f8ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58553478f21783d18d58ca0a1a4ab58a.png)
![](https://img.xkw.com/dksih/QBM/2018/7/15/1988821410856960/1990480303570944/STEM/fbabac9d95d34fc688b3bab46ace6219.png?resizew=174)
A.1个 | B.2个 | C.3个 | D.4个 |
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