【问题情境】数学课上,王老师出示了这样一个问题:如图1,在矩形
中,
,
是
延长线上一点,且
,连接
,交
于点
,以
为一边在
的左下方作正方形
,连接
.试判断线段
与
的位置关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/30f7c138-0824-4d3e-8d6d-dd3b06ac7dda.png?resizew=226)
【探究展示】小明发现,
垂直平分
,并展示了如下的证明方法:
证明:∵
,∴
.
∵
,∴
.
∵四边形
是矩形,∴
.
∴ .(平行线分线段成比例)
∵
,∴
.∴
.
即
是
的
边上的中线,
又∵
,
∴ .(等腰三角形的“三线合一”)
∴
垂直平分
.
【反思交流】
(1)请将上述证明过程补充完整;
(2)小颖受到小明的启发,继续进行探究,如图2,连接
,以
为一边在
的左下方作正方形
,发现点
在线段
的垂直平分线上,请你给出证明;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/0eb2ec25-c000-47d0-9dc2-a800c421c2eb.png?resizew=461)
(3)【拓展应用】如图3,连接
,以
为一边在
的右上方作正方形
,分别以点
,
为圆心,
为半径作弧,两弧交于点
,连接
.若
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.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/ac047e91852b91af639feec23a9598b2.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/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/30f7c138-0824-4d3e-8d6d-dd3b06ac7dda.png?resizew=226)
【探究展示】小明发现,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019a351c8982e78e7c69503880e2f7a2.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b929269c53a44907dba8ee298a0a522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
∴ .(平行线分线段成比例)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479b9cd3d4a1c6707a7dc608734d4f44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4796a77ffd026046b8eefd50938830a2.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
∴ .(等腰三角形的“三线合一”)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【反思交流】
(1)请将上述证明过程补充完整;
(2)小颖受到小明的启发,继续进行探究,如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/0eb2ec25-c000-47d0-9dc2-a800c421c2eb.png?resizew=461)
(3)【拓展应用】如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4293e691e7159acd1c514e67608d548a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2022-06-05 22:26:57
|
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解答题-证明题
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【推荐1】如图1,点O为正方形
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的中点,
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,过点O作
,分别交
,
于点N,F.过点D作
于点H,交直线
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(1)①如图2,当点M与点A重合时,可知点D,N重合,点E,F,B重合,请直接写出此时
与
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②请你猜想图1中线段
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与
之间的数量关系是______;并证明你的猜想.
(2)点M在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/266ce772-aefe-497d-b785-2d1477860d67.png?resizew=453)
(1)①如图2,当点M与点A重合时,可知点D,N重合,点E,F,B重合,请直接写出此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②请你猜想图1中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(2)点M在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec8156abd6b02c4bef5eafd48a88d04.png)
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您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐2】已知:点
是平行四边形
对角线
所在直线上的一个动点(点
不与点
、
重合),分别过点
、
向直线
作垂线,垂足分别为点
、
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/18d1d8bb-d663-4c01-8b08-3568dee475e3.png?resizew=375)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/22415e3f-b850-4921-ac4a-fc743ed9e8e1.png?resizew=237)
(1)当点
与点
重合时如图
,易证
(需证明);
(2)直线
绕点
逆时针方向旋转,当
时,如图
、图
的位置,猜想线段
、
、
之间有怎样的数量关系?请写出你对图
、图
的猜想,并选择一种情况给予证明.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/22415e3f-b850-4921-ac4a-fc743ed9e8e1.png?resizew=237)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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您最近一年使用:0次
解答题-问答题
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较难
(0.4)
名校
【推荐1】如图1,对角线互相垂直的四边形叫做垂美四边形.
(1)概念理解:如图2,在四边形
中,
,
,问四边形
是垂美四边形吗?请说明理由.
(2)性质探究:如图1,试探索垂美四边形
两组对边
、
与
、
之间的数量关系并说明理由.
(3)问题解决:如图3,分别以
的直角边
和斜边
为边向外作等腰直角三角形
和等腰直角三角形
,使得
,
,
,连接
,
,
,已知
,
,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/8fd70822-1064-42fc-a822-bb75f827fe31.png?resizew=468)
(1)概念理解:如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)性质探究:如图1,试探索垂美四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)问题解决:如图3,分别以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7a6901af6bf907d2baf1b42a0a704d.png)
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解答题-作图题
|
较难
(0.4)
名校
【推荐2】四边形
是正方形,
是对角线,点
是
上一点(不与
中点重合),过点
作
的垂线,在垂线上取一点
,使
,并且点
和点
在直线
的同侧,连结
并延长至点
,使
,连结
.
①根据题意,补全图形;
②求
的度数,判断线段
和
的数量关系并给出证明.
(2)若点
是正方形内任意一点,如图2所示,则(1)中的结论还成立吗?如果成立,给出证明;如果不成立,说明理由.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3d3b55561ec5d4acc242ecd1c7f41.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/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a1615f459ecd7e79c2abe769fbec4f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
①根据题意,补全图形;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b0b831b56c1a03925d0f5a332d8ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐1】如图,在平行四边形ABCD中,点E,F,G,H分别在边AB,BC,CD,DA上,AE=CG,AH=CF,且EG平分∠HEF.
(1)求证:△AEH≌△CGF.
(2)若∠EFG=90°.求证:四边形EFGH是正方形.
(1)求证:△AEH≌△CGF.
(2)若∠EFG=90°.求证:四边形EFGH是正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/90c3ea39-62e6-4d1f-94bd-af6a23d26a95.jpg?resizew=178)
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【推荐2】如图,在△ABC中,∠ACB=90°,AC=BC,点D在边AB上,连接CD,将线段CD绕点C顺时针旋转90°至CE位置,连接AE
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/ba72b2d0-fece-4bf1-ae7e-c217e21cc81d.png?resizew=168)
(1)求证:AB⊥AE;
(2)若BC2=AD•AB,求证:四边形ADCE为正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/ba72b2d0-fece-4bf1-ae7e-c217e21cc81d.png?resizew=168)
(1)求证:AB⊥AE;
(2)若BC2=AD•AB,求证:四边形ADCE为正方形.
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【推荐3】【问题提出】
(1)如图1,在
和
中,
,边
与
在一条直线上,
于点
,若
,
,则
的长为______.
【问题探究】
(2)如图2,点
为正方形
的对角线
的中点,点
为
上一点,连接
,过点
作
交
的延长线于点
,连接
,试判断
是否为等腰直角三角形,并说明理由;
【问题解决】
(3)为实现全民健身的需要,某房地产商在进行居民小区设计时考虑在小区内修建一个室内健身中心.如图3,矩形
是该居民小区的一块空地,点
为矩形空地的对称中心,
为该矩形空地的对角线,经测量,
米,
,房地产商计划在
上取一点
(不与端点重合),
的延长线上取一点
,将
区域修建为室内健身中心,根据规划要求,
,设
的长为
米,室内健身中心(
)的面积为
平方米.
①求
与
之间的函数关系式;
②按照设计要求,发现当
的长度为80米时,整体布局比较合理,试求当
米时,室内健身中心(
)的面积.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59281d3136f2c67c078d98842171224d.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/7b92bdf778aa32f238bad820d72d62f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1e20c7d6a31428ef33bb76b5b06744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【问题探究】
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
【问题解决】
(3)为实现全民健身的需要,某房地产商在进行居民小区设计时考虑在小区内修建一个室内健身中心.如图3,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a3debb802dd4f3e774b16ad1c154ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②按照设计要求,发现当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672f273e802bab76b9e87ba2f5c45c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
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【推荐1】如图,在△ABC中,AC=BC=5,AB=8,点P在AB上,点Q在AC或AC的延长线上,AQ=AP,以AP、AQ为邻边作菱形APRQ,设AP的长为x,菱形APRQ与△ABC重影部分图形的面积为y(平方单位),
(1)求sinA的值.
(2)当x为何值时,点R落在BC上.
(3)当菱形APRQ与△ABC重叠部分的图形为四边形时,求y与x的函数关系式.
(4)直接写出当x为何值时,经过三角形顶点的直线同时将菱形、三角形的面积二等分.
(1)求sinA的值.
(2)当x为何值时,点R落在BC上.
(3)当菱形APRQ与△ABC重叠部分的图形为四边形时,求y与x的函数关系式.
(4)直接写出当x为何值时,经过三角形顶点的直线同时将菱形、三角形的面积二等分.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/20e0e457-e7d9-4ef9-80cc-a53b468761e4.png?resizew=239)
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【推荐2】点A坐标为
,点B坐标(0,6),点D坐标
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd50cdef-a7bf-4dec-8ecb-02e0bc92a924.png?resizew=298)
(1)若
,垂足为E,延长OE至点C,连接BC,使得
.求证:
;
(2)若
,且
,连接EB与AO交于点T,求T点坐标(用含t的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00e1beb309e45e52341ce67bc18ce94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180735d52856f4393e40e28e7fcc95bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd50cdef-a7bf-4dec-8ecb-02e0bc92a924.png?resizew=298)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e94633285fd100c13a7cd4d13fad631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208d67fb019c8b336234244c3104987c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b1472e121da0ae5550329cfda5f0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
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