点O为直线
上一点,将一直角三角板
的直角顶点放在点O处,射线
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/f5515876-9438-4ce2-8a59-b4a215b491cd.png?resizew=380)
(1)如图①,若
,求
的度数;
请把下列解题过程补充完整:
,
(已知)
°
∵OE平分
(已知)
°(角平分线定义)
(已知)
°;
(2)若图①中
,求
的度数(用含
的代数式表示);
(3)将图①中的三角板
绕顶点O顺时针旋转至图②的位置,其他条件不变,那么问题(2)中所求出的结论是否还成立?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f6a9fcd59fc2476fc307fa8a3a9250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/f5515876-9438-4ce2-8a59-b4a215b491cd.png?resizew=380)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcc6ea3a5df3a1c0104f36b3c51455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
请把下列解题过程补充完整:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8520b1ca9e64c7eae7a21dabd63ca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcc6ea3a5df3a1c0104f36b3c51455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34db9809f59c7eb235f4b6a03467096a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
∵OE平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245dc11094edee5d0fcf8ffb199fad8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2138311f7055573f06bc6f6e8924d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a450411ead625a6120446a4f7c12f1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)若图①中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f435c3556b48f0eccc958240fc6c7d6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)将图①中的三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f6a9fcd59fc2476fc307fa8a3a9250.png)
更新时间:2024-02-28 20:53:15
|
相似题推荐
解答题-作图题
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适中
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名校
【推荐1】七年级上册《数学实验手册》中有“三角尺拼角”的问题.将一副三角尺如图这样放置,就可画出
,在实验中同学们发现用一副三角尺还能画出其他特殊角.
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(1)请你借助三角尺完成以下操作,并在所画图形上标注所使用三角尺的相应角度;
①设计用一副三角尺画出
角的画图方案,并画出相应的几何图形;
②用一副三角尺能画出
的角吗?__________.(填“能”或“不能”).
(2)利用一副三角尺在图中画出
的角平分线
,并在所画图形上标注所使用三角尺的相应角度.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/68af221c-401c-496c-9c32-5171b3b16edb.png?resizew=111)
(3)如图,现有
角的三种模板,
,
,
请设计一种方案,只用给出的一种模板画出
的角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/2013e70d-0134-48d4-a627-3081fdce3cb9.png?resizew=383)
小冬想出了一个方案,利用
角模板画出
角,动手操作:如图,M、O、N三点在一条直线上,将
的顶点B与点O重合,
边与射线
重合,如图所示,将
绕点O逆时针旋转
,得
,再将
绕点O逆时针旋转
,得
,……,如此连续操作18次,再利用两个平角等于一个周角,可得
的角,即:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/ecbb82f3-4e12-4283-b641-3d191cb02ed6.png?resizew=209)
请从
或
角模板中选一个你认为能画出
角的模板,设计一个方案,并说明理由.
(4)对于任意一个
(n为正整数)角的模板,只用此模板是否一定能画出
的角?请作出判断,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6dd249c03feba4343809280690343fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/063ac46d-65cb-4e57-8372-b8a8334aa4a4.png?resizew=253)
(1)请你借助三角尺完成以下操作,并在所画图形上标注所使用三角尺的相应角度;
①设计用一副三角尺画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b975f35ecfc9641688e682bcee70e1f4.png)
②用一副三角尺能画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17910022fc9a7ea596967fcabdab7493.png)
(2)利用一副三角尺在图中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/68af221c-401c-496c-9c32-5171b3b16edb.png?resizew=111)
(3)如图,现有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b8b362ff4a9a98748e060895b1c0a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b9b4c745985d5208530abfd7f9d610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f7f06d8f0936b9a29cfb40c9513ab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331124f979b1032d85e8597c27d166db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a840804ee07144f46c9c2a33e33ae450.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/2013e70d-0134-48d4-a627-3081fdce3cb9.png?resizew=383)
小冬想出了一个方案,利用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67725fb831dbdce07df72abe3b24459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a840804ee07144f46c9c2a33e33ae450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67725fb831dbdce07df72abe3b24459.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f6b22b844aec1e37eb5d6c0d423350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67725fb831dbdce07df72abe3b24459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186be5a4af88950adb4e5fcf98f58858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a840804ee07144f46c9c2a33e33ae450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846c45b5acfed1bbc30a70c6380c5297.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/ecbb82f3-4e12-4283-b641-3d191cb02ed6.png?resizew=209)
请从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2690e1a00ef032f0d6a0082e4eee46b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707d14deed56ff2667c9ddaeef35ebf9.png)
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(4)对于任意一个
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您最近一年使用:0次
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【推荐2】如图,将一副三角板中的两个直角顶点C叠放在一起,其中
,
,
.
,求
的度数;
(2)试猜想
与
的数量关系,请说明理由;
(3)若按住三角板
不动,绕顶点C转动三角板
,试探究
等于多少度时,
,并简要说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
(2)试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
(3)若按住三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,已知∠AOB是直角,OE平分∠AOC,OF平分∠BOC.
(1)若∠BOC=60°,求∠EOF的度数;
(2)若∠AOC=x°(x>90),此时能否求出∠EOF的大小,若能,请求出它的数值
(1)若∠BOC=60°,求∠EOF的度数;
(2)若∠AOC=x°(x>90),此时能否求出∠EOF的大小,若能,请求出它的数值
![](https://img.xkw.com/dksih/QBM/2019/12/3/2347036558860288/2347313985740800/STEM/01151fe90d96469d9665679f66e9ff88.png?resizew=95)
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解答题-计算题
|
适中
(0.65)
【推荐2】已知
,在射线
的上方作射线
,再以射线
为始边绕着点
逆时针度转
得到角的终边
,作
的平分线
,设
.
(1)如图1,当
时,
__________
;
(2)如图2,当
时,
__________
;
(3)如图3,当
时,求
的度数(用含
的代数式表示);
(4)当
时,根据(1)~(3)的计算过程,请猜想
的度数.(用含
的代数式表示,直接写出结论即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/f326aaa5-b697-40bb-a52c-a7da5954a152.png?resizew=477)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7209c73ac82338a7def4decc693dc633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b600f913d6d700bbd332b34220b78a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f158832d4c0f7cb508a89ff13763bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b600f913d6d700bbd332b34220b78a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b5ea2fc43b19ca043581eb94197234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
解答题-问答题
|
适中
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【推荐3】ABCD是长方形纸片的四个顶点,点E、F、H分别边AD、BC、AD上的三点,连接EF、FH.
(1)将长方形纸片的ABCD按如图①所示的方式折叠,FE、FH为折痕,点B、C、D折叠后的对应点分别为B′、C′、D′,点B′在FC′上,则∠EFH的度数为 ;
(2)将长方形纸片的ABCD按如图②所示的方式折叠,FE、FH为折痕,点B、C、D折叠后的对应点分别为B′、C′、D'(B′、C′的位置如图所示),若∠B'FC′=16°,求∠EFH的度数;
(3)将长方形纸片的ABCD按如图③所示的方式折叠,FE、FH为折痕,点B、C、D折叠后的对应点分别为B′、C′,D′(B′、C′的位置如图所示).若∠EFH=n°,则∠B′FC′的度数为 .
(1)将长方形纸片的ABCD按如图①所示的方式折叠,FE、FH为折痕,点B、C、D折叠后的对应点分别为B′、C′、D′,点B′在FC′上,则∠EFH的度数为 ;
(2)将长方形纸片的ABCD按如图②所示的方式折叠,FE、FH为折痕,点B、C、D折叠后的对应点分别为B′、C′、D'(B′、C′的位置如图所示),若∠B'FC′=16°,求∠EFH的度数;
(3)将长方形纸片的ABCD按如图③所示的方式折叠,FE、FH为折痕,点B、C、D折叠后的对应点分别为B′、C′,D′(B′、C′的位置如图所示).若∠EFH=n°,则∠B′FC′的度数为 .
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884263614275584/2885903758991360/STEM/9957bfbc86c240ecb7422921825cbd35.png?resizew=474)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,直线
,直线
与
分别相交于点
,
.小宁将一个含
角的直角三角板
按如图1放置,使点
分别在直线
上,且
.
______
(填“
”“
”或“
”).
(2)
的平分线
交直线
于点
.
①如图2,当
时,求
的度数;
②如图3,小宁将三角板
沿直线
左右移动,并保持
(点
不与点
重合),在平移的过程中求
的度数(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd367de57e8d6092e003df6a9044e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da10094d05fc6ccfa7b5a5be9112f78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be452c8bdea6b4e4c7a6d96e9dc6a51c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384de89ffa3abe2329d5b1f35b4c1c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931beb39d4195978ced2fbc666fa1bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67327208e852af5499e367796b35d162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5dbfcff5c8b5d4e312a9247b2b8b0a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2b6f26f81404f16f2b29714ac1b9ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②如图3,小宁将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384de89ffa3abe2329d5b1f35b4c1c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】一个问题的解决往往经历发现规律——探索归纳——问题解决的过程,下面结合一道几何题来体验一下.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/ca27c9bd-3b7a-4c07-a041-e5320810ac31.png?resizew=476)
(1)【发现规律】如图①,已知
,
,则
的度数为______时,
为
的角平分线.(直接写出结果)
(2)【探索归纳】如图①,
,
,
为
的角平分线,猜想
的度数(用含
,
的代数式表示),并说明理由.
(3)【问题解决】如图②,若
,
,
,射线
,
同时绕点
旋转,
以每秒10°顺时针旋转,
以每秒20°逆时针旋转,当
与
重合时,
,
同时停止运动.设运动时间为
秒,问
为何值时,射线
为
,
,
中任意两条射线夹角的角平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/ca27c9bd-3b7a-4c07-a041-e5320810ac31.png?resizew=476)
图① 图② 备用图
(1)【发现规律】如图①,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe7193c2f8382d8d2f826d0b80c190f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79684a6e92297749c005e2b23cac9710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(2)【探索归纳】如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbd1fb163a8b61185306423a5343d338.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc47d201a4d73d5745098dcfeacedcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)【问题解决】如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016b87b47382104d37176f9cef5a6022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a94a3697e5685193cd3f68cd7964373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ca8efe3c3e3648ffefa4e29e6cf51b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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