如图1,已知正方形
,把一个直角与正方形叠合,使直角顶点与一重合,当直角的一边与
相交于E点,另一边与
的延长线相交于F点时.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/57c4f0d8-0bc4-46f1-93b3-5aa3f8d983b2.jpg?resizew=433)
(1)证明:
;
(2)如图2,作
的平分线交
于G点,连接
.证明:
;
(3)如图3,将图1中的“直角”改为“
”,当
的一边与
的延长线相交于E点,另一边与
的延长线相交于F点,连接
.线段
,
和
之间有怎样的数量关系?并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/57c4f0d8-0bc4-46f1-93b3-5aa3f8d983b2.jpg?resizew=433)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fdc587c3766098bf3be2879d0f2703a.png)
(3)如图3,将图1中的“直角”改为“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2016-12-05 21:03:11
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知:如图,在菱形
中,
,点
、
分别在
、
上运动,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/69acdc17-5ba9-44b5-9dcb-ba88c44b0c76.png?resizew=178)
(1)试说明:
.
(2)判断
是什么特殊的三角形,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97075fe3c2a105f5d2d0a27a9f2b3410.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/69acdc17-5ba9-44b5-9dcb-ba88c44b0c76.png?resizew=178)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f4327ea35caa3b4aab5da25b7ee8a91.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
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【推荐2】在
中,
,
,M是
边的中点,过点M作
交
于点P,交
于点Q,试求
三者之间的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24a705cee24f9c5f2a4f176c1dfe77d.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知
,点B,C,D在一条直线上,
,
,
,
![](https://img.xkw.com/dksih/QBM/2021/7/1/2755020553281536/2788672969465856/STEM/b4d08a52-97a9-47c1-97ff-82e813eb6c98.png)
(1)
与
全等吗?为什么?
(2)你还能得到哪些线段的相等关系?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680fb0a3f3cba59fc3092fb9b0a89008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b92bdf778aa32f238bad820d72d62f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5010be422c4f22b45e5a476f4c6457.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2755020553281536/2788672969465856/STEM/b4d08a52-97a9-47c1-97ff-82e813eb6c98.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(2)你还能得到哪些线段的相等关系?为什么?
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解答题-证明题
|
适中
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【推荐2】如图,在△ABC中,∠ACB=90°,D,E分别是AB,BC的中点,CF∥AB交DE的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698763488501760/2700901231894528/STEM/38edc8c40dad49adb8e6440d2091fe7f.png?resizew=152)
(1)求证:△BDE≌△CFE.
(2)若AC=8,CF=5,求BC的长.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698763488501760/2700901231894528/STEM/38edc8c40dad49adb8e6440d2091fe7f.png?resizew=152)
(1)求证:△BDE≌△CFE.
(2)若AC=8,CF=5,求BC的长.
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,
是
的内接三角形,
,
为
中劣弧
上一点,延长
至点
,使
.
![](https://img.xkw.com/dksih/QBM/2020/6/5/2478096685629440/2478130567815168/STEM/d79f260fe33644eba078f14f9a5962d1.png?resizew=168)
(1)求证:
;
(2)若
,试探究
与
长度的大小关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://img.xkw.com/dksih/QBM/2020/6/5/2478096685629440/2478130567815168/STEM/d79f260fe33644eba078f14f9a5962d1.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5639af5a02601a0f9388cd22dbb8c7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb026064f722ee4bfd7ffd84551306da.png)
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【推荐2】如图,在△ABC中,∠C=90°,AD平分∠BAC,DE⊥AB于点E,点F在AC上,且BD=DF.求证:
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978605805854720/3045694100881408/STEM/b58e68a4683c4a8daa7f85d8233a314e.png?resizew=153)
(1)CF=EB;
(2)AF+EB=AE.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978605805854720/3045694100881408/STEM/b58e68a4683c4a8daa7f85d8233a314e.png?resizew=153)
(1)CF=EB;
(2)AF+EB=AE.
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在正方形
中,
于点
,点
、
分别在边
、
上.求证:
.
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名校
【推荐2】如图正方形
,将射线
绕点
顺时针旋转
(
),旋转后的射线与线段
交于点
,作
于点
,点
与点
关于直线
对称,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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