综合与实践
问题情境:
已知四边形
是正方形,点P是直角三角尺的直角顶点.
(1)如图1,将点P放在正方形
的顶点A处,三角尺的两条直角边分别与
,
的延长线交于点E,F,则
与
之间的数量关系为_______.
操作发现:
(2)如图2,将点P放在正方形
的对角线
上,三角尺的两条直角边分别与
,
的延长线交于点E,F,则(1)中的结论还成立吗?请说明理由.
拓广探索:
(3)如图3,将点P放在正方形
的边
上(不包含点B,C),三角尺的一条直角边经过点A,另一条直角边与正方形的外角
的平分线
相交于点E,试判断
与
之间的数量关系,并说明理由.
问题情境:
已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)如图1,将点P放在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
操作发现:
(2)如图2,将点P放在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/6b1bd1adfe4cc6566218f19970c2fd3b.png)
拓广探索:
(3)如图3,将点P放在正方形
![](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/0b5c4253bdb0cd70c706d6d1fa554218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
更新时间:2024-05-11 10:48:45
|
相似题推荐
解答题-证明题
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较难
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名校
解题方法
【推荐1】如图,在菱形
中,
是对角线
上一点,
是线段
延长线上一点,且
连接
.
(1)发现问题
如图①,若
是线段
的中点.连接
其他条件不变,填空:线段
与
的数量关系是 ;
![](https://img.xkw.com/dksih/QBM/2020/7/14/2505784074371072/2507331018514432/STEM/da77267196b746daadcbf9d90c263b21.png?resizew=174)
(2)探究问题
如图②,若
是线段
上任意一点,连接
其他条件不变,猜想线段
与
的数量关系是什么?请证明你的猜想;
(3)解决问题
如图③,若
是线段
延长线上任意一点,其他条件不变,且
,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa6f89ea44f721efc1418904dd5a389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/4e2ce5fc7025fb96a88518198d5f50bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(1)发现问题
如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08853507633615a8fe733731eb242f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2020/7/14/2505784074371072/2507331018514432/STEM/9b4eef71fdc14cc3be3acce969be78d8.png?resizew=112)
![](https://img.xkw.com/dksih/QBM/2020/7/14/2505784074371072/2507331018514432/STEM/44f747a5d6234ec5af3e40d865c73f8b.png?resizew=113)
![](https://img.xkw.com/dksih/QBM/2020/7/14/2505784074371072/2507331018514432/STEM/da77267196b746daadcbf9d90c263b21.png?resizew=174)
(2)探究问题
如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08853507633615a8fe733731eb242f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)解决问题
如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd6ab24b070333cdb8fbdee6260ab52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】已知:如图1,梯形
中,
,
,
,
,E是直线
上一点,联结
,过点E作
交直线
于点F,联结
,
上一点(与点A、D不重合),(如图1所示)
①求证:
;
②设
,
的面积为y,求y关于x的函数解析式,并写出此函数的定义域;
(2)直线
上是否存在一点E,使
是
面积的3倍,若存在,直接写出
的长,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b173ac8cc4ac4f1c9e1daaa605fbb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5441d73845911db1993bf903c4d8700f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3a3137299ffaea0545cd45323f1af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2e1083b773e16d1e385072652f7319.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c421ab2dc57f44899efb36549781347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-问答题
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【推荐3】综合与实践课上,老师让同学们以“图形的变换”为主题开展数学活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/ae8701f5-1cc3-4a98-8d7d-2ce3a7fab6f5.png?resizew=615)
(1)操作判断
如图1,将矩形纸片
折叠,使
落在边
上,点
与点
重合,折痕为
,即可得到正方形
,沿
剪开,将正方形
折叠使边
,
都落在正方形的对角线
上,折痕为
,
,连接
,如图2.根据以上操作,则
____________
.
(2)迁移探究
将图2中的
绕点
按顺时针旋转,使它的两边分别交边
,
于点
,
,连接
,如图3.探究线段
,
,
之间的数量关系,并说明理由.
(3)拓展应用
连接正方形对角线
,若图3中的
的边
,
分别交对角线
于点
,
,将正方形纸片沿对角线
剪开,如图4,若
,
,请直接写出
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/ae8701f5-1cc3-4a98-8d7d-2ce3a7fab6f5.png?resizew=615)
(1)操作判断
如图1,将矩形纸片
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74465e560f3cd0bf656131020eb205d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a02295b56d4f94521133b91e1403e4.png)
(2)迁移探究
将图2中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936af8bf3f3ed7a2d40e1211860fc347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67716ac738ee2911a69bf4063110a5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71432131d194730a67f3192d1f8679b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9020059d62af7498039f091de6f005ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71432131d194730a67f3192d1f8679b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e89bcda280422e4adae1ea85678dc6.png)
(3)拓展应用
连接正方形对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d2d4aa39abfb9bf99ec7ffd6a1dbe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42774a918f52ac8aa8b1f5b78a676f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78442aba4de44c5d4759fb23e294fc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80370d6e9601837daaa7d92a06da704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c94f911645182a3a16ef7b155627584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c6163af13c0277bc633fc9b4a83700.png)
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解答题-证明题
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【推荐1】如图,在平面直角坐标系中,A、B分别是x轴、y轴上的动点,点D是线段
垂直平分线上的点,且
轴,C为
的中点,连接
并延长交折线
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/4fbe234f-18a5-4c15-b4a8-89a1920caf26.png?resizew=148)
(1)当
时,试说明D、E两点重合,并说明此时四边形
的形状;
(2)当点E在线段
上时,①求证:
;②若
,求证:
;
(3)若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198a7f2708b1cf3a54629903d575e19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd4da709e3687300e6d7ec269c22f89.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/4fbe234f-18a5-4c15-b4a8-89a1920caf26.png?resizew=148)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b76ac232477ac6d4b0a36eded969d68.png)
(2)当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ecf862a648eff7e6cbb044c8765f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e94633285fd100c13a7cd4d13fad631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4a9d47ba452e73eece00d67467cede.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ff13b4da65c7da3d898ba58e967b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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名校
【推荐2】教材呈现
例:如图(1),在
中,
,
是斜边
上的中线.求证:
.
证明:延长CD至点E,使
,连接
.
……
(1)请根据教材提示,结合图(1)写出完整的证明过程.
(2)初步探究
如图(2),在四边形
中,
,
,
,
于点P,连接
,
,且
.
①
的度数为______.
②求
的长.
(3)拓展运用
如图(3),在
中,
,
,F是
边上一点,且
;按以下步骤作图:①以点B为圆心,以适当的长为半径作弧,分别交
,
于点M,N;②分别以点M,N为圆心,以大于
的长为半径作弧,两弧交于点E,作射线
.过点F作
交
于点P,过点P作
于点G,Q为射线
上一动点,连接
,
.若
,请直接写出
的值.
例:如图(1),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
证明:延长CD至点E,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3692cbeb579e58fef5217b2637b9cc.png)
……
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/0eb69b78-d4dd-4d3d-b6d0-16cb8ea8fca8.jpg?resizew=595)
(1)请根据教材提示,结合图(1)写出完整的证明过程.
(2)初步探究
如图(2),在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45723dce96b74f027adcb1a4ecd19db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ea309886e947ea7cb4b81716206fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c5e7ab5a46dd74168a6555fd6bf6b6.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)拓展运用
如图(3),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e1ca12da27075e5241b7c7ce74672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d620c2be45414bb73c591aef51469271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d7566369c178316219bb466a66d062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e66b12019cdf68327d34c90dff7c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22072cf9e5d4259f8f51e5c94490bf93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
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解答题-证明题
|
较难
(0.4)
名校
【推荐1】已知:在
中,
,点
为直线
上一动点(点
不与
重合).以
为边作正方形
,连接
.
(1)如图1,当点
在线段
上时,求证:
.
(2)如图2,当点
在线段
的延长线上时,其他条件不变,请直接写出
三条线段之间的关系;
(3)如图3,当点
在线段
的反向延长线上时,且点
分别在直线
的两侧.其他条件不变,若连接正方形对角线
,交点为
,连接
,探究
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66baa9f8abaf83b11701e9bedaea379a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44227b9fd1bfa178ca1ecdbd98edbf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b78d48bd70b977715edc09b1ca98a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/26/6812d00c-3fde-4d17-a2f9-b83e9c83500c.png?resizew=504)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74451cb021d33293b020876f90e433f.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a59e25a8ad452acc373d18e7d5581c1.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/586bc9bae6acc8490f7bf09bbdb93ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df290956504e3113c9d006431a15a8f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fcee9e91b9bdd4665803e36a9a596b.png)
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(0.4)
名校
【推荐2】如图,正方形ABCD中,点E是AB边上一点,点F是BC边上一点,连接EF,设∠EDF=
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/8ae2d6a4-3df5-4ca5-93ee-6248f68784b1.png?resizew=403)
(1)如图1,若
=45°,E为AB的中点,则
的值为______.
(2)如图2,若
=30°,过点E作EM∥BC交DF于M点,问AE+CF与EM有何数量关系?请说明理由.
(3)如图3,若
=60°,AD=4,直接写出S△DEF的最大值:______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/8ae2d6a4-3df5-4ca5-93ee-6248f68784b1.png?resizew=403)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f579c72ae028016cdebbee4220ab136.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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