如图,直线a∥b,点A,点D在直线b上,射线AB交直线a于点B,CD⊥a于点C,交射线AB于点E,AB=12cm,AE:BE=1:2,P为射线AB上一动点,P从A点开始沿射线AB方向运动,速度为1cm/s,设点P运动时间为t,M为直线a上一定点,连接PC,PD.
(1)当t=m为何值时,PC+PD有最小值,求m的值;
(2)当t<m(m为(1)中的取值)时探究∠PCM、∠PDA与∠CPD的关系,并说明理由;
(3)当t>m(m为(1)中的取值)时,直接写出∠PCM、∠PDA与∠CPD的关系.
(1)当t=m为何值时,PC+PD有最小值,求m的值;
(2)当t<m(m为(1)中的取值)时探究∠PCM、∠PDA与∠CPD的关系,并说明理由;
(3)当t>m(m为(1)中的取值)时,直接写出∠PCM、∠PDA与∠CPD的关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/5adcdf8c-22fc-427a-a869-44721e630ca6.png?resizew=397)
19-20七年级下·重庆北碚·期末 查看更多[5]
重庆市北碚区西南大学附属中学校2019-2020学年七年级下学期期末数学试题(已下线)专题4.4 三角形【压轴题型专项训练】-2020-2021学年七年级数学下学期期末专项复习(北师大版)(已下线)第01练:与三角形有关的线段-2022年【寒假分层作业】八年级数学(人教版)(全国通用)(已下线)7.4 认识三角形-【帮课堂】2021-2022学年七年级数学下册同步精品讲义(苏科版)(已下线)专题7.35 平面图形的认识(二)(最值问题)(巩固篇)(专项练习)-2022-2023学年七年级数学下册基础知识专项讲练(苏科版)
更新时间:2021-03-08 10:28:19
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相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】课题学习:平行线的“等角转化”功能.
外一点,连接
、
,求
的度数.阅读并补充下面推理过程.
解:过点A作
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
.
解题反思:从上面的推理过程中,我们发现平行线具有“等角转化”的功能,将
、
、
“凑”在一起,得出角之间的关系,使问题得以解决.
(2)方法运用:如图2,已知
,求
的度数;
(3)深化拓展:已知
,点C在点D的右侧,
,
平分
,
平分
,
,
所在的直线交于点E,点E在直线
与
之间.
①如图3,点B在点A的左侧,若
,求
的度数.
②如图4,点B在点A的右侧,且
,
.若
,求
度数.(用含n的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e991613b9b3752c354808e1f001cac0.png)
解:过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14dbafa1565aa5fb728b1b6edc1f8a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a7a45b202b4227d56801cedfb4f4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e00e83dfe9194d7ebac8cb4215db1a.png)
解题反思:从上面的推理过程中,我们发现平行线具有“等角转化”的功能,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)方法运用:如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03733d1465d041a6d6da32bf91a7cff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded11f1d465cee30733c43bbd332bbfd.png)
(3)深化拓展:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b17b275d892a076f768524c400a6f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①如图3,点B在点A的左侧,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fdd7a7dcc801f20d1b59fe1798bff07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
②如图4,点B在点A的右侧,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ce3618abaf1907e7661e4204047f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4652f95f3a388706906bc85f53f8db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074d1bdb0a6c414fa3d8b8b316e2e9b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
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【推荐2】如图,由线段
,
,
,
组成的图形像∑,称为“∑形
”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/3b7a1866-f1cd-4491-a390-2e899ef0f215.png?resizew=525)
(1)如图1,∑形
中,若
,则
_______
;
(2)如图2,连接∑形
中B,D两点,过点A作
,若
,
,用
的值表示
的值,并说明理由;
(3)如图3,已知
,
平分
,
平分
.若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40afe4ad45ffc486e5cfce6f48962b5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/3b7a1866-f1cd-4491-a390-2e899ef0f215.png?resizew=525)
(1)如图1,∑形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40afe4ad45ffc486e5cfce6f48962b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09269af39c61a98e0aef0c13efe1ef01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb985ac5d93b85b6299834627aa95ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,连接∑形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40afe4ad45ffc486e5cfce6f48962b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0adba493bf7fd59158f255276d72ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6caf69e618ca0137b54b26b82ca6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c61650a2f45c28d0f63abb807307ae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1432005237ada3a91efcdc3a1085b2b8.png)
(3)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836ea820cf3732508cdd332ceb9395ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971ef52a8dc3e77a4fc2331f2a1f8439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
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【推荐1】如图1,在平面直角坐标系中,点
,
在坐标轴上,其中
满足
,点
在线段
上.
,
两点的坐标;
(2)将
平移到
,点
对应点
,点
对应点
,若
,求
,
,
的值;
(3)如图2,若点
,
也在坐标轴上,
为线段
上一动点(不包含点
,点
),连接
,
平分
,
,试探究
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c8bbf9aae63aa5d8503cb9ae06ed573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1ee8f08161ac7b88f276a6e8ec9281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e91bfceb1437a8b066119b54e1b58de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88518dce73863715498d412eb3bdde6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd5600d9a50bc1ba40edf69a7a53cca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab9cff8cfecda786300f6487378c792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48000da8c9e5783f286892d1a41e1e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1e11eb018b719028cb49a9bb2d7088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37cfe566a87ee78d544239bf68671f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
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解答题-证明题
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较难
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【推荐2】已知
,点
在
上,点
在
上,点
为射线
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/a204534b-1faf-44d8-b988-c4d867a51426.png?resizew=365)
(1)(基础问题)如图1,试说明:
.(完成图中的填空部分)
证明:过点
作直线
,
又
,
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
___________
.
(2)(类比探究)如图2,当点
在线段
延长线上时,直接写出
、
、
三者之间的数量关系.
(3)(应用拓展)如图3,
平分
,
交
于点
,且
,
,
,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/a204534b-1faf-44d8-b988-c4d867a51426.png?resizew=365)
(1)(基础问题)如图1,试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e758277b8dd10d1ae128f6dd1102960.png)
证明:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31307b00524e461b0ad8dfbcdf24bacf.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe9353e99abfcf4048066770298aea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3c7e3ec1cbfe2b1f1879f85a95e90c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6200ee85c6a6869b0d422a2a1beece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73c256acb5e374fef82ea9653322821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea0bc1c09a947db8e6ed959a22909c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b344dc3b035a370036de4f14777da0.png)
(2)(类比探究)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d74465c34ad7afa5d39d9e300bdf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(3)(应用拓展)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f31dac46d98b34afe54fa9cc085ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea718690917f8c929c11c089ad2dc2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fb22e8003b0950e9118783d303e451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6b53bde5d8d7c91b51bfa6a5811f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432e5b3363cee002dc04ced784ea6197.png)
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【推荐1】把三根长为3cm、4cm和5cm的细木棒首尾相连,能搭成一个直角三角形.
(1)如果把这三根细木棒的长度分别扩大为原来的a倍(a>1),那么所得的三根细木棒能不能搭成一个直角三角形, 为什么?
(2)如果把这三根细木棒的长度分别延长x cm(x>0),那么所得的三根细木棒还能搭成一个三角形吗?为什么?如果能,请判断这个三角形的形状(锐角三角形、直角三角形还是钝角三角形),并说明理由.
(1)如果把这三根细木棒的长度分别扩大为原来的a倍(a>1),那么所得的三根细木棒能不能搭成一个直角三角形, 为什么?
(2)如果把这三根细木棒的长度分别延长x cm(x>0),那么所得的三根细木棒还能搭成一个三角形吗?为什么?如果能,请判断这个三角形的形状(锐角三角形、直角三角形还是钝角三角形),并说明理由.
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解答题-证明题
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较难
(0.4)
【推荐2】[问题情境]数学活动课上,老师出示了一个问题:如图1,在正方形
中,
是
的中点,
,
与正方形的外角
的平分线交于
点.试猜想
与
的数量关系,并加以证明:
[实践探究]希望小组受此问题启发,逆向思考这个题目,并提出新的问题:如图2,在正方形
中,
为
边上一动点(点
,
不重合),
是等腰直角三角形,
,连接
,可以求出
的大小,请你思考并解答这个问题.
[拓展迁移]突击小组深入研究希望小组提出的这个问题,发现并提出新的探究点:如图3,在正方形
中,
为
边上一动点(点
,
不重合),
是等腰直角三角形,
,连接
.知道正方形的边长时,可以求出
周长的最小值.当
时,请你求出
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
[实践探究]希望小组受此问题启发,逆向思考这个题目,并提出新的问题:如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/099dd87a526391f830ac2a11e7d7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b78356dbceb326e1b1561e0a15d8ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf7cc67acfa50ef6b21d9aa379e604a.png)
[拓展迁移]突击小组深入研究希望小组提出的这个问题,发现并提出新的探究点:如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](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/099dd87a526391f830ac2a11e7d7ad56.png)
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