综合与实践课上,同学们以“矩形的折叠”为主题开展数学活动.
沿过点A 的直线折叠,使点 B落在
边上的点
处,折痕为
,则四边形
的形状为 .
(2)如图2,矩形纸片
的边长
,用图1中的方法折叠纸片,折痕为
,接着沿过点 D 的直线折叠纸片,使点 C落在
上的点
处,折痕为
.则
,
.
(3)如图3,矩形纸片
的长为
,宽为
,用图1的方法折叠纸片,折痕为
,在线段
上取一点 F(不与点
重合),沿
折叠
,点 C的对应点为
延长
交直线
于点 G.
①判断
与
的数量关系,并证明;
②当射线
经过
的直角边的中点时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd0d50f4c6ed9cdb340f214a5aec4bb.png)
(2)如图2,矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa38f041e2bf7d4a48c26be1924cae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3a9293c39b2595efa1347c541daa95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d9ae440bc188af69ed07bb7074e8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b6d0cf1c51302804d95d715178a7dc.png)
(3)如图3,矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78a9462a38db32bcad8c9e4aeaa926d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcb350074994eccd15cd3126ceabce41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824ac174d168f4ed43ffd35dcc868cef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d8345187c6b7d5d56714cc4966a1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4250a88d0aef9fcac1511220b172e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe16a6227ad768a70e81a4cd9ca2052.png)
②当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a13d6e5b1d375e5de0b062d7f36e62b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4cacd518769ce19310f5d9c6e73b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
更新时间:2024-06-12 13:29:16
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解答题-证明题
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【推荐1】如图,已知AD是△ABC的中线, DE⊥AB于E, DF⊥AC于F, 且BE=CF, 求证:(1)AD是∠BAC的平分线;(2)AB=AC.
![](https://img.xkw.com/dksih/QBM/2018/8/21/2015260538683392/2050072787640321/STEM/abae35c2-853d-47c5-bb46-6c800f05b4fd.png?resizew=245)
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【推荐2】已知:如图,已知点B、E、F、C在同一直线上,AB=CD,AE
BC,DF
BC,E,F是垂足,CE=BF,求证:AB//CD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/2020/10/19/2574532595081216/2576727287070720/STEM/6cb1985cee7f4e92af6b17e1a777c793.png?resizew=157)
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名校
【推荐1】如图,
为矩形
的对角线,将边
沿
折叠,使点B落在
上的点M处,将边
沿
折叠,使点D落在
上的点N处.
![](https://img.xkw.com/dksih/QBM/2023/5/18/3240604794798080/3242089428246528/STEM/571ffb1158a643ffadd754a2d3941aa8.png?resizew=160)
(1)求证:四边形
是平行四边形;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2023/5/18/3240604794798080/3242089428246528/STEM/571ffb1158a643ffadd754a2d3941aa8.png?resizew=160)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-证明题
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【推荐2】如图,在矩形ABCD中,AD=10,点E是AD上一点,且AE=m (m是常数),作△BAE关于直线BE的对称图形△BFE,延长EF交直线BC于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/e39915e7-5991-4013-afd1-39123d046146.png?resizew=390)
(1)求证:EG=BG;
(2)若m=2.
①当AB=6时,问点G是否与点C重合,并说明理由;
②当直线BF经过点D时,直接写出AB的长;
(3)随着AB的变化,是否存在常数m,使等式BG
AE=AB2总成立?若存在,求出m的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/e39915e7-5991-4013-afd1-39123d046146.png?resizew=390)
(1)求证:EG=BG;
(2)若m=2.
①当AB=6时,问点G是否与点C重合,并说明理由;
②当直线BF经过点D时,直接写出AB的长;
(3)随着AB的变化,是否存在常数m,使等式BG
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5743a3bf50e8146f519a7b4f32a958b5.png)
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解答题-证明题
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【推荐1】如图,在
中,
,
,点E是边
的中点,连接
,
的延长线与边
相交于点F,
,交
于点G,连接
、
.
(1)求证:
;
(2)已知______(从以下两个条件中选择一个作为已知,填写序号),请判断四边形
的形状,并证明你的结论.
条件①:
;
条件②:
.
(注:如果选择条件①条件②分别进行解答,按第一个解答计分)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de13b90ee61450dcf26f2f04b010b3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/59633bfe-eb7e-4d81-850b-ee144164adde.png?resizew=247)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80d2aed22e902b6ca34ca02a5769533.png)
(2)已知______(从以下两个条件中选择一个作为已知,填写序号),请判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d2783577c5f0c2e38d26650acb3c49b.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(注:如果选择条件①条件②分别进行解答,按第一个解答计分)
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解答题-证明题
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【推荐2】如图,四边形
中,
,
,过点D分别作
的延长线的垂线,垂足分别为点E,F,设
,
,
,
.
(1)证明:四边形
是正方形;
(2)用a,b,c表示四边形
的面积;
(3)请根据本题情境,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98efae3dffa2db7004f5a937ff503171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da01f682d1d4e5dd24bd26ec18540b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/4d491a59-ae3b-475d-8467-d6dcb2377e67.png?resizew=160)
(1)证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)用a,b,c表示四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)请根据本题情境,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3133ef62aad6bdd6637140620f068fad.png)
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解答题-作图题
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【推荐1】已知,如图,在Rt△ABC中,
.
(1)按要求尺规作图:
①作
的角平分线交BC与点D;
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900704070975488/2900931744776192/STEM/4dda68205c1242cdad1dd80b6e3c281e.png?resizew=165)
②求作圆O,使得圆O经过AD两点且圆心在线段AB上.
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900704070975488/2900931744776192/STEM/4dda68205c1242cdad1dd80b6e3c281e.png?resizew=165)
(2)求证:BC是
的切线;
(3)若
,
.求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
(1)按要求尺规作图:
①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900704070975488/2900931744776192/STEM/4dda68205c1242cdad1dd80b6e3c281e.png?resizew=165)
②求作圆O,使得圆O经过AD两点且圆心在线段AB上.
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900704070975488/2900931744776192/STEM/4dda68205c1242cdad1dd80b6e3c281e.png?resizew=165)
(2)求证:BC是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321f96c4f808afe67cf565ca74ae0351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab3a73f947fe58f60d067b9c51e76a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
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适中
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【推荐2】已知
和
均为等腰直角三角形,
绕点
逆时针旋转一周.
(1)如图
,连接
,
,则
与
的数量关系为_______;直线
与
所夹角的度数为_______.
(2)当
旋转至如图
所示的位置时,取
,
的中点
,
,连接
,
.试问:
的值是否随
的旋转而变化?若不变,请求出该值;若变化,请说明理由.
(3)
,
分别为
,
的中点,连接
.若
,
,当
旋转至
,
,
三点在同一条直线上时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/6cc90ead-d6a6-49b6-bba7-e9d4e129d648.png?resizew=530)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2044b01c3e9f0bdece72ad17bdfd886d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5644573f740b68ea941bd49eb3253a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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