如图,在正方形
中,点E、F、G分别在
上,且
,垂足为O.
(1)求证:
;
(2)若O是
的中点,且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eddfc2ab7a88b22219c298ac8093b25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51246bfbcf524ed6da2eceec37712470.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/631dfa92-6554-458b-87bb-7d20303f5ae7.png?resizew=142)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/110458927f3f396a5bc27ea4a3b1a3e9.png)
(2)若O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c5c9cc1ed4bce98b7fae77e70b227f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
更新时间:2023-10-12 22:14:52
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831a93b5b75d7010763a64f5f8045564.png)
(2)如图,▱
中,
为
边的中点,连
并与
的延长线交于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831a93b5b75d7010763a64f5f8045564.png)
(2)如图,▱
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4455c912f5902021222a3f59d16b91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/9ce7b702-992c-446c-87b6-eb4de37a6135.png?resizew=142)
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【推荐2】如图,在四边形
中,E为
上一点,
,
,且
,
,求证:四边形
为平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093d0e0a5dabcc44de67edb10f80fb2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00252b239725c0f2e92b31d508416ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d163ba9cef35eb600387bcfbbda89ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
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【推荐1】在
中,
°,
,点
在线段
上,以
为边作正方形
,
与
的交点分别为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
(1)求证:
;
(2)若点
为
的中点,求
的长;
(3)当
为等腰三角形时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c041684b2d1b90aaca06997e471a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27763f6dcbae61e12858d1893034164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f23da5bc0c9e2acd1f120e00be7298c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029ad83f1a3262048cba0e650b63e929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437924024696832/2438629650407424/STEM/3ff2166ba7d2409699b07345ae66b96f.png?resizew=232)
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名校
【推荐2】如图,
内接于
,
是
的直径,E是
长线上一点,且
.
是
的切线;
(2)若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc8849bf90e14f61c4e689702f18096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96461af9193d5d7867ddf8fcbefcaec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a6a941132e7f8c1ef20ec2ac231f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccc3194fb7cf286a40c8f0ea49ae0b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955f4f211d4ad8f2a61e209b934cb079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】阅读理解
阅读下列材料,完成相应任务.
直角三角形斜边上的中线等于斜边的一半
如图1,△ABC中,∠ABC=90°,BD是斜边AC上的中线.求证:BD=
AC.
分析:要证明BD等于AC的一半.可以用“倍长法”将BD延长一倍,如图2,延长BD到E,使得DE=BD.连接AE,CE.可证四边形ABCE是矩形,由矩形的对角线相等得BE=AC,这样将直角三角形斜边上的中线与斜边的数量关系转化为矩形对角线的数量关系,进而得到BD=
AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/0b815328-bec9-4bf4-801a-b1e6fb859d7a.png?resizew=417)
(1)任务一:请你按材料中的分析写出证明过程;
(2)任务二:上述证明方法中主要体现的数学思想是 ;
A.转化思想 B.类比思想
C.数形结合思想 D.从一般到特殊思想
(3)任务三:如图3,点C是线段AB上一点,CD⊥AB,点E是线段CD的中点,分别连接AD、BE,点F,G分别是AD和BE的中点,连接FG.若AB=12,AC=CD=8,则FG= .
阅读下列材料,完成相应任务.
直角三角形斜边上的中线等于斜边的一半
如图1,△ABC中,∠ABC=90°,BD是斜边AC上的中线.求证:BD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
分析:要证明BD等于AC的一半.可以用“倍长法”将BD延长一倍,如图2,延长BD到E,使得DE=BD.连接AE,CE.可证四边形ABCE是矩形,由矩形的对角线相等得BE=AC,这样将直角三角形斜边上的中线与斜边的数量关系转化为矩形对角线的数量关系,进而得到BD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/9/0b815328-bec9-4bf4-801a-b1e6fb859d7a.png?resizew=417)
(1)任务一:请你按材料中的分析写出证明过程;
(2)任务二:上述证明方法中主要体现的数学思想是 ;
A.转化思想 B.类比思想
C.数形结合思想 D.从一般到特殊思想
(3)任务三:如图3,点C是线段AB上一点,CD⊥AB,点E是线段CD的中点,分别连接AD、BE,点F,G分别是AD和BE的中点,连接FG.若AB=12,AC=CD=8,则FG= .
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,在矩形
中,
是对角线,分别以点B,D为圆心,以大于
长为半径作弧,分别交
于点M,交
于点N,连接
交BD于点O,连接
,
. 已知
,
.
(1)求证:四边形
是平行四边形.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/3eba6562-5ca2-4330-b28a-3eb0181a22d5.png?resizew=183)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a796e9136e2e6e7ecbdc245c242018.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee50a23604ea2a9c1f3649dab97c2e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
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【推荐1】如图①,在正方形ABCD中,点P是对角线BD上的一点,点E在AD的延长线上,且PC=PE,PE交CD于点F
(1)证明:PA=PE;
(2)求∠CPE的度数;
(3)如图②,把正方形ABCD改为菱形ABCD,当∠ABC=60°,连接CE,请直接写出线段AP与线段CE的数量关系,不必说明理由.
![](https://img.xkw.com/dksih/QBM/2021/5/15/2721619471794176/2789568869736448/STEM/ae7712fc-da10-423d-b216-f04a73cfbbbf.png)
(1)证明:PA=PE;
(2)求∠CPE的度数;
(3)如图②,把正方形ABCD改为菱形ABCD,当∠ABC=60°,连接CE,请直接写出线段AP与线段CE的数量关系,不必说明理由.
![](https://img.xkw.com/dksih/QBM/2021/5/15/2721619471794176/2789568869736448/STEM/ae7712fc-da10-423d-b216-f04a73cfbbbf.png)
![](https://img.xkw.com/dksih/QBM/2021/5/15/2721619471794176/2789568869736448/STEM/d93fc27a-e9f7-4cd2-b2e3-0c3a93fe9c62.png)
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【推荐2】如图,在正方形ABCD中,E,F是BD上的两点,且BE=DF
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/fdf28069-0f6a-4605-b030-cbcc507d8b41.png?resizew=149)
(1)求证:四边形AECF是菱形.
(2)若正方形面积为32,DE=1,求菱形AECF的面积
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/fdf28069-0f6a-4605-b030-cbcc507d8b41.png?resizew=149)
(1)求证:四边形AECF是菱形.
(2)若正方形面积为32,DE=1,求菱形AECF的面积
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