在
中,
,
.
(1)如图1,点D为边
上一点,过D作
于E点,连接
,F为
的中点,连接
,
,
,则
的形状是 ;
【问题探究】
(2)如图2,将图1中的
绕点B按逆时针方向旋转,使点D落在
边上,F为AD的中点,试判断
的形状并说明理由;
【拓展延伸】
(3)在(2)的条件下,若
,
,将
绕点B按逆时针方向旋转,当点D在线段
上时,直接写出线段
的长 (用含m的式子表示).
![](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/ab926d89b65f26c12e3da73ef1e5cf68.png)
(1)如图1,点D为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
【问题探究】
(2)如图2,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321370fe42bc1216902ea19fbd2a5979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
【拓展延伸】
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2d9d9adad09281ca67132bdce523fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3704a0e07f4c91f2b5047cd20cae1fd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321370fe42bc1216902ea19fbd2a5979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
更新时间:2024-06-05 12:59:48
|
相似题推荐
解答题-证明题
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【推荐1】【活动探究】在数学课上,老师出示了一个问题:如图1,在菱形
中,
,
,点E,F分别是
,
边上一点,若
,试猜想
的形状,不用证明.
【尝试实践】小美受此启发,她尝试将“
”改为“
”,通过测量验证发现猜想仍然成立,并进一步思考证法:如图2,过点F作
,求证
……
请你按照小美的思路进一步思考,并解答这个问题.
【拓展应用】小玲在老师问题上进一步改编:如图3,过C作
于点G,当
的中点M经过
时,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.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/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
【尝试实践】小美受此启发,她尝试将“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cedc6911d02394383004ef17213ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc93ed7ca69476da54cd89198f36537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c9b5c2eccaf71272588614ea32dffd.png)
请你按照小美的思路进一步思考,并解答这个问题.
【拓展应用】小玲在老师问题上进一步改编:如图3,过C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f4eb640505099730001c4cbe65c3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图,CA=CB,CD=CE,
,AD、BE交于点H,连接CH.
(1)求证:AD=BE,∠DHE=∠DCE;
(2)判断下列两个结论是否正确,(正确打“√”,不正确打“×”),若正确请证明;
①CH平分∠BCD;( )
②HC平分∠AHE;( )
(3)若∠DCE=60°,试判定线段CH,DH,HE之间有什么样的数量关系,说明理由?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f145e6d68a0903d4d10f27cf647ddc7.png)
(1)求证:AD=BE,∠DHE=∠DCE;
(2)判断下列两个结论是否正确,(正确打“√”,不正确打“×”),若正确请证明;
①CH平分∠BCD;( )
②HC平分∠AHE;( )
(3)若∠DCE=60°,试判定线段CH,DH,HE之间有什么样的数量关系,说明理由?
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【推荐3】折纸操作简单,但数学趣味丰富,我们可以通过折纸开展数学探究,探索数学奥秘.
操作1 | 如图1,将矩形纸片![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
问题1 | 求![]() | |
问题2 | 判断线段![]() ![]() | |
操作2 | 如图2,N为矩形纸片![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
问题3 | 写出![]() ![]() |
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【推荐1】如图是高空秋千的示意图,小明从起始位置点A处绕着点
经过最低点
,最终荡到最高点
处,若
,点A与点
的高度差
米,水平距离
米,求点
与点
的高度差
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/60096d11a222426d712390d3aad75ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/7e6a82d7-5fc5-4795-a6be-405de9ef613e.png?resizew=363)
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【推荐2】已知,点
是正方形
所在平面上一点,直线
与直线
相交于点.直线
与直线
相交于点
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/53d2a75a-4bd9-4372-a74e-61cc940a6772.png?resizew=163)
(1)如图
,当点
在正方形内部,且
时,求证:
;
(2)如图
,当点
在正方形外部,
依题意补全图
;
用等式表示线段
,
,
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7250d3955ca3fa0607e2356496e8a70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/8934218f-03c6-4959-85c9-22ee31fc7b47.png?resizew=126)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/29/53d2a75a-4bd9-4372-a74e-61cc940a6772.png?resizew=163)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b528e0a151476029798f70feec7c4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4fad6bb8c937ad480ced3f09c3b3a40.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐1】(1)问题背景:如图1,已知△ABC∽△ADE,求证:△ABD∽△ACE;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/2b973687-9d7c-4d76-9245-2870cd012bd7.png?resizew=141)
(2)尝试运用:矩形ABCD中,∠ACB=30°,Rt△AEF中,∠EAF=90°,∠AFE=30°,将Rt△AEF绕A旋转至图2位置,使得点F落在BD上,此时
,求此时
的值;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/99de4802-4058-4182-9f9d-66ab96c9a5b2.png?resizew=195)
(3)拓展创新:如图3,Rt△ABC中,∠ACB=90°,
,D为AB上一点,H为AC上一点,∠ABC=∠HDC,CB=CD,直接写出
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/2b973687-9d7c-4d76-9245-2870cd012bd7.png?resizew=141)
(2)尝试运用:矩形ABCD中,∠ACB=30°,Rt△AEF中,∠EAF=90°,∠AFE=30°,将Rt△AEF绕A旋转至图2位置,使得点F落在BD上,此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56970784b3fa226b7ba03b122fa81d2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf50f5e0498ff868e6d1332877b4e8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/99de4802-4058-4182-9f9d-66ab96c9a5b2.png?resizew=195)
(3)拓展创新:如图3,Rt△ABC中,∠ACB=90°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1aa23e5b3f00df055013b199d7b227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910cfbafea951eafd719a14c185a6af2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/f1cd3078-b9ec-40e0-b4fa-100fb64c3f8d.png?resizew=113)
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【推荐2】如图1,AB是⊙O的直径,BC是⊙O的切线,CE切⊙O于点E,D是CE延长线上一点,DE=DA.
(1)求证:AD与⊙O相切;
(2)若直径AB=12,BC=x,AD=y,求y与x之间的函数关系式;
(3)如图2,过点E作EH⊥AB于点H,已知AD=4,BC=9,求EH的长.
(1)求证:AD与⊙O相切;
(2)若直径AB=12,BC=x,AD=y,求y与x之间的函数关系式;
(3)如图2,过点E作EH⊥AB于点H,已知AD=4,BC=9,求EH的长.
![](https://img.xkw.com/dksih/QBM/2021/2/3/2650235153752064/2652786238636032/STEM/217b877c-6f09-4f99-a82c-00025ed20708.png)
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解答题-作图题
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名校
解题方法
【推荐1】如图,点
在
轴上,以点
为圆心的圆,交
轴于
、
两点,交
轴于
、
两点,
,
.
(1)求圆心
的坐标;
(2)将
绕点
旋转
,得到
.请在图中画出线段
、
,判断四边形
的形状,请说明理由,并直接写出点
坐标.
(3)设点
为
上一个动点,连接线段
与
相交于点
,点
为
的中点,过点
作
于
,连接
、
.在点
的运动过程中
的大小是否变化?若不变,求出
的度数;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
(1)求圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b265d121f9ebc13671a5719604476a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beeedb7ddaac2cd3d37151d058ab7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff3d1126edfb95418994f607db08ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a7fe0c575693d381936d45b6ef6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a8588dc60a543ad70d6bc0d263dbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28389a0483b819928116a03af028d509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28389a0483b819928116a03af028d509.png)
![](https://img.xkw.com/dksih/QBM/2020/11/8/2591813148065792/2610499770097664/STEM/d6d511089618464ba564e6a88b735996.png?resizew=211)
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真题
名校
【推荐2】【问题情境】
在综合实践活动课上,李老师让同桌两位同学用相同的两块含
的三角板开展数学探究活动,两块三角板分别记作
和
,设
.
【操作探究】
如图1,先将
和
的边
、
重合,再将
绕着点A按顺时针 方向旋转,旋转角为
,旋转过程中
保持不动,连接
.
时,
________;当
时,
________
;
(2)当
时,画出图形,并求两块三角板重叠部分图形的面积;
(3)如图2,取
的中点F,将
绕着点A旋转一周,点F的运动路径长为________.
在综合实践活动课上,李老师让同桌两位同学用相同的两块含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a0300def37b2681a0068f1abf54e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
【操作探究】
如图1,先将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c761e9e5a9ba76912e061686e633d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284750727aa2c32b2477d126daefb329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c761e9e5a9ba76912e061686e633d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60057103273cbf497495520528da7dda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
(3)如图2,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c761e9e5a9ba76912e061686e633d0.png)
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