名校
1 . 如图,在等边
中,D,E分别是
,
的中点,且点P是线段
上的一个动点,当
的周长最小时,P点的位置在( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/74bff2db-8d4c-4880-9d36-fad6e8736561.png?resizew=138)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/74bff2db-8d4c-4880-9d36-fad6e8736561.png?resizew=138)
A.A点处 | B.D点处 |
C.![]() | D.![]() |
您最近一年使用:0次
2023-12-21更新
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266次组卷
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9卷引用:2023年山东省济南市中考二模数学试题变式题6-10题
(已下线)2023年山东省济南市中考二模数学试题变式题6-10题2023年山东省临沂市中考数学考前模拟预测题河北省邯郸市临漳县2020-2021学年八年级下学期期末考试数学试题福建省三明市梅列区2020-2021学年八年级下学期期中数学试题 山东省滨州市集团校联考2021-2022学年八年级上学期第一次检测数学试题 天津市红桥区第二学区2021-2022学年八年级上学期期中考试数学试题(已下线)专题13.16 课题学习——最短路径问题(基础篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(人教版)海南省海口市琼山区海南中学2022-2023学年八年级上学期期中数学试题甘肃省张掖市甘州区第一中学2021-2022学年七年级下学期期末数学试题
2 . 如图1,在等腰
中,
,
.点D为
边上的点,连接
,在边
下方作
,使得
,且
,在射线
上取一点F,使得
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/6c6f3ada-eb36-4006-8a0d-e28f20e1a154.png?resizew=355)
(1)求证:
;
(2)当
时,求
的长度;
(3)如图2,在
右侧作
于点A,延长
交
于点H,当
是以
为腰的等腰三角形时,则
的长为 (直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348216467fda035329fe8fac46b39911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18bf69272287d8ae9e2f5a0a62d53dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e9117971f05c31673e93bcdeec5424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/6c6f3ada-eb36-4006-8a0d-e28f20e1a154.png?resizew=355)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc65be8bb4fbc8a5d3cdd3378fc0d59.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd88179404ab1804dc88ec755e863d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5334469e92d39043db84d86b792aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
名校
3 . 如图,在
中,
,
是
的垂直平分线,
恰好平分
.若
,则
的长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
A.2 | B.3 | C.![]() | D.![]() |
您最近一年使用:0次
2023-12-21更新
|
216次组卷
|
4卷引用:内蒙古自治区呼和浩特市新城区实验中学2023-2024学年八年级上学期期中数学试题
内蒙古自治区呼和浩特市新城区实验中学2023-2024学年八年级上学期期中数学试题(已下线)第06讲 角平分线-【寒假自学课】2024年八年级数学寒假提升学与练(北师大版)(已下线)专题04 垂直平分线和角平分线(八大题型)(题型专练)-2023-2024学年八年级数学下册《知识解读·题型专练》(北师大版)(已下线)专题03 角平分线和垂直平分线的性质和应用(八大题型)(题型专练)-2023-2024学年七年级数学下册《知识解读·题型专练》(北师大版)
名校
4 . 如图,
中,
,
于点
,
于点
,
,
与
交于点
,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/67833c1e-352c-4c94-a926-45b5ddf79eb6.png?resizew=144)
(1)证明:
;
(2)探究
和
之间的数量关系,并说明理由;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/67833c1e-352c-4c94-a926-45b5ddf79eb6.png?resizew=144)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8bb808edb7f81fb3c14c8f3d7f0fad.png)
(2)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
5 . 【问题背景】
如图,
是边长为6的等边三角形,点
为
上一动点,连接
的垂直平分线分别交
于
,连接
.
【尝试证明】
(1)如图1,若点
是线段
上的动点.
求证:①
;
②
.
【拓展升华】
(2)如图2,若点
是线段
延长线上的点,当
时,求
与
的面积之比.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff016af723be023e1525ce85d69fe94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19409d6d120387b3bccd934c4911bb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94165c5047e68e952df7a8dc6dc32fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468848d6778ba56ef340bde4ff84834d.png)
【尝试证明】
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb54d2b5fdd80b981bcc4e0797cc9f62.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7752dd084ab0a30d8febec991587ad9d.png)
【拓展升华】
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276d0071f4fa02e931c31a1fc32d9618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8289f505d2cfbec2a4264e14b18f946e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/c5eecd58-f90f-41be-8bf0-6d23aa44b9f9.png?resizew=262)
您最近一年使用:0次
名校
6 . 如图,在
中,
.
(1)尺规作图:作
的外接圆(保留作图痕迹);
(2)求(1)中所作外接圆的半径
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1664c48b037ae1e8a7419cdf0e1cdd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/c51c742a-e50d-46ae-9f1b-959981d59a4b.png?resizew=156)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求(1)中所作外接圆的半径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
您最近一年使用:0次
2023-12-21更新
|
119次组卷
|
2卷引用:江苏省镇江市2023-2024学年九年级上学期期中数学试题
7 . 如图,在
中,
平分
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/4f170d67-72fa-4e13-baf7-54751e36a405.png?resizew=242)
(1)用尺规完成以下基本作图:过点
作
于点
,交
于点
,连接
;(不写作法,不下结论,保留作图痕迹)
(2)求证:
,请根据下列证明思路完成填空:
证明:
____________,
.
于点
,
(____________)
在
和
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229ad9e4aa38b247f1abf8f938280852.png)
(____________).
____________
是线段
的垂直平分线
(____________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/4f170d67-72fa-4e13-baf7-54751e36a405.png?resizew=242)
(1)用尺规完成以下基本作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d6b98ecb4793c9f063f1f6b61caa19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113bffa74ac1e976a5c468ccde2dc860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f75cd01b3689408ebb2bcea4b25f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d257e50f224710383ad7a1b2da603d4.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d671ea595b1a638992a531471ab47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022f0dc17db5fcc83b204dc845447ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229ad9e4aa38b247f1abf8f938280852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87d978d02e1ccc8112746d456dcbab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56577eaa2f4ed14e6e4330a801a59293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a860c6ab2c48b1c458f54fdb23fa8bd.png)
您最近一年使用:0次
名校
8 . 如图,在
中,分别以A,C为圆心,大于
长为半径作弧,两弧分别相交于M,N两点,作直线
,分别交线段
,
于点D,E.若
,
的周长为15cm,则
的周长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/e84ee01e-b495-49fc-bbd4-ab4aa3343233.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef38b4bb05275221fe5a7d4bb6e6d1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb961bd7db3adb76af2d4cedb611bd7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/e84ee01e-b495-49fc-bbd4-ab4aa3343233.png?resizew=171)
A.11cm | B.13cm | C.15cm | D.17cm |
您最近一年使用:0次
9 . 如图,在
中,
是
边上的一点,且
,
,
与
相交于点
,
与
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/0af82074-269a-4c68-a817-81c18556794a.jpg?resizew=202)
(1)证明:
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd72e399cbc9beead45a955482dd315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/0af82074-269a-4c68-a817-81c18556794a.jpg?resizew=202)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5dd0a04b4d04a7ee193d54fa3c34b3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4792ce7ccdda8140fd96c5e257660244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb13a51b4a70ee26d9311f6d32ac62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
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名校
10 . 如图,在
中,
.动点P从点A出发以每秒1个单位长度沿
向终点C运动,同时动点Q以每秒2个单位长度从点B出发沿
向点A运动,到达A点后立刻以原来的速度沿
返回.当点Q到达点B时停止运动,点P也同时停止.连接
,设运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/f89cb7c6-b8dd-468e-b6d5-c1e0a3916fc0.jpg?resizew=136)
(1)记
的面积为S,请用含有t的代数式来表示S;
(2)伴随着P,Q两点的运动,线段
的垂直平分线为直线l,当直线l经过点A时,求
的长;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b3fd8b668748bc896ebd45e32b6a17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf4b43b6792b9ae78a1c8cae4e60524.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/f89cb7c6-b8dd-468e-b6d5-c1e0a3916fc0.jpg?resizew=136)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0719ae600f0efeeaba659bb54e2edc6e.png)
(2)伴随着P,Q两点的运动,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
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