如图,正方形ABCD中,AB=4,点E是BA延长线上一点,点M、N分别为边AB、BC上的点,且AM=BN=1,连接CM、ND,过点M作MF∥ND与∠EAD的平分线交于点F,连接CF分别与AD、ND交于点G、H,连接MH,则下列结论正确的有( )个
①MC⊥ND;②sin∠MFC=
;③(BM+DG)²=AM²+AG²;④S△HMF=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5294d690e81bbc5c4898c97c538953f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/898cc66f-38fa-4744-aef1-709969f20e7b.png?resizew=132)
①MC⊥ND;②sin∠MFC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5294d690e81bbc5c4898c97c538953f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/898cc66f-38fa-4744-aef1-709969f20e7b.png?resizew=132)
A.1 | B.2 | C.3 | D.4 |
19-20九年级上·广东深圳·期末 查看更多[5]
广东省深圳市宝安区2019-2020学年九年级上学期期末数学试题(已下线)期末难点特训(四) 选填压轴50道-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(北师大版)2023年广东省深圳市龙华区中考一模数学试卷(已下线)专题06 四边形-学易金卷:2023年中考数学一模试题分项汇编(广东专用)海南省海口市龙华区海口中学2022-2023年九年级上学期期中数学试题2
更新时间:2020-01-14 19:48:36
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解题方法
【推荐1】如图,在
中,
.动点
从点
出发沿着射线
的方向以每秒1cm的速度移动,动点
从点
出发沿着射线
的方向以每秒2cm的速度移动.已知点
和点
同时出发,设它们运动的时间为
秒.连接
.下列结论正确的有( )个
;
②当
时,
;
③以点
为圆心、
为半径画
,当
时,
与
相切;
④当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87792c29df531206061c6788c4a7d87a.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/8455657dde27aabe6adb7b188e031c11.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/203f139bd61c85c5ee129c23d744cea0.png)
③以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37389ddce05f6e2d2b86b7a28cdaf985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca722232c6311cf8d398d2b6d65bad3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae0b0f3eb5ffbeadb0e8acfc4703960.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在菱形
中,
,
,点
在
上,
,若点
是菱形
四条边上异于点
的一点,
,则以下长度中,不可能是
的长度的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/c8ccda36-d767-4a5a-990d-4a31b79fe5ba.png?resizew=208)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
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【推荐1】如图,在正方形ABCD中,对角线AC与BD相交于点O,AE、DF分别是∠OAD与∠ODC的角平分线,AE的延长线与DF相交于点G,则下列结论中,不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/14c04daf-4e45-4efb-bb18-a6bf52949184.png?resizew=186)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/14c04daf-4e45-4efb-bb18-a6bf52949184.png?resizew=186)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在正方形
中,对角线
和
相交于点O,点E在
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于点F,连接
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垂足为点H,以
为边作等边三角形
,连接
交
于点M,下列四个命题或结论:①
;②
;③
;④若
,则四边形MEDG的面积是
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