1 . 如图,在
中,
,点D,F在边
上,过点D作
交
于点E,G为
上一点,连接
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/c2246962-9437-4f35-a0b5-83a5f9287c2c.jpg?resizew=166)
(1)求证:
;
(2)若点E为
的中点,且
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379302aa2a275b57ea792760e57b1476.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/c2246962-9437-4f35-a0b5-83a5f9287c2c.jpg?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8749af9160536ab7088e80521c1de414.png)
(2)若点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59660256bc313611803edf9935407f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54c6f5286b3b913e0a2af5fea1f71ba.png)
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2卷引用:辽宁省丹东市2023-2024学年八年级上学期期末数学试题
2 . 如图,将长为6cm的橡皮筋水平放置,固定两端A和B,然后把中点C竖直向上拉升至D点,使得橡皮筋被拉长了4cm,则橡皮筋竖直升高的距离
为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/20dddf05-d866-44fc-9d7e-4a01dc635705.png?resizew=137)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/20dddf05-d866-44fc-9d7e-4a01dc635705.png?resizew=137)
A.3cm | B.4cm | C.5cm | D.6cm |
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2卷引用:辽宁省丹东市2023-2024学年八年级上学期期末数学试题
名校
3 . 如图,
中
的垂直平分线分别交
、
于点
、
,点
为
上一动点,则
的最小值是以下哪条线段的长度( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/39ad5313-b22c-40cd-89a7-01886e33878e.png?resizew=125)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.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/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9053054055199b6f13fddcc5802f7201.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/39ad5313-b22c-40cd-89a7-01886e33878e.png?resizew=125)
A.![]() | B.![]() | C.![]() | D.![]() |
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18卷引用:辽宁省葫芦岛市绥中县2023-2024学年八年级上学期期中数学试题
辽宁省葫芦岛市绥中县2023-2024学年八年级上学期期中数学试题重庆市南开中学2021-2022学年八年级上学期入学考试数学试题安徽省阜阳市2021-2022学年八年级上学期期中数学试题山东省德州市陵城区2021-2022学年八年级上学期期中数学试题天津市第七中学2021-2022学年八年级上学期期末数学试题北京市东城区2021-2022学年八年级上学期期末数学试题河北省邯郸市永年区2021-2022学年八年级上学期期末数学试题天津市滨海新区塘沽第一中学2021-2022学年八年级上学期期中考试数学试题黑龙江省哈尔滨市巴彦县2022-2023学年八年级上学期期中数学试卷(已下线)人教版(2012)八年级上册期末冲刺小卷五河南省驻马店市平舆县2022-2023学年八年级上学期期中数学试题(已下线)专题07 最短路径问题(3类经典题型+优选提升)-【好题汇编】备战2023-2024学年八年级数学上学期期中真题分类汇编(人教版)黑龙江省哈尔滨市巴彦县华山乡第一中学2022-2023学年八年级上学期期中数学试题黑龙江省哈尔滨市尚志市苇河镇中学2022-2023学年八年级上学期期中数学试题安徽省芜湖市第二十九中学2023-2024学年八年级上学期期中数学试题江苏省南京大学附属中学2023-2024学年八年级上学期数学期末模拟综合评估试题江苏省徐州市邳州市宿羊山初级中学2023-2024学年八年级上学期期末数学试题四川省绵阳市安州区2023-2024学年八年级上学期期末数学试题
4 . 如图,在
中,
,请观察尺规作图的痕迹(D,E,F分别是连线与
边的交点),则
的度数是()
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/853dca0d-d2f9-4d1e-86b1-324d6fb11cc2.png?resizew=194)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e4e2717c5c61f8461c945717a6b4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/853dca0d-d2f9-4d1e-86b1-324d6fb11cc2.png?resizew=194)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
5 . 如图,已知在
中,边
的垂直平分线
交
于点E,再以点B为圆心,任意长为半径画弧交
,
于点M,N,再分别以M,N为圆心,大于
长为半径画弧交于点P,作射线
恰好交
于点
.若
,
,
的面积为9,则
的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/59371583-7412-4b72-ada2-d67a1bddde11.png?resizew=193)
![](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/d004d2d115b477ade6af7ddb93db0df8.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e1ca12da27075e5241b7c7ce74672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.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/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/59371583-7412-4b72-ada2-d67a1bddde11.png?resizew=193)
A.9 | B.12 | C.30 | D.27 |
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2卷引用:辽宁省大连市庄河市2023-2024学年八年级上学期期末数学试题
6 . 如图,在中,
,
,
垂直平分
,垂足为Q,交
于点P.按以下步骤作图:①以点A为圆心,以适当的长为半径作弧,分别交边
于点D,E;②分别以点D,E为圆心,以大于
的长为半径作弧,两弧相交于点F;⑤作射线
.若
与
的夹角为
,则α的度数为( )
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
7 . (1)阅读理解:如图1,在
中,若
,
.求
边上的中线
的取值范围,小聪同学是这样思考的:延长
至
,使
,连接
.利用全等将边
转化到
,在
中利用三角形三边关系即可求出中线
的取值范围,在这个过程中小聪同学证三角形全等用到的判定方法是______,中线
的取值范围是______;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/cc708eae-08b2-424e-8a91-f03663bbd38d.png?resizew=141)
(2)问题解决:如图2,在
中,点
是
的中点,
.
交
于点
,
交
于点
.求证:
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/ba5c0c1c-e629-4c92-bb12-bfff64bee161.png?resizew=153)
(3)问题拓展:如图3,在
中,点
是
的中点,分别以
,
为直角边向
外作
和
,其中
,
,
,连接
,请你探索
与
的数量与位置关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/cc708eae-08b2-424e-8a91-f03663bbd38d.png?resizew=141)
(2)问题解决:如图2,在
![](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/e47f2874795e9df280e3e0bec171358e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b01908bf059263d6548ea1ec12be20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/ba5c0c1c-e629-4c92-bb12-bfff64bee161.png?resizew=153)
(3)问题拓展:如图3,在
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ebc9a7a29f686f4288c70391897b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1029f5256edc6652fc4efb87f6b55569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94db851a2a0c17afbb635820dcf552f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7115b9ba0494ead745fc91f6b145e8c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217ae5ea057e69f31439fef55812c851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/b8e5280a-2069-45c3-ae48-9ec652f217b9.png?resizew=166)
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15卷引用:辽宁省营口市大石桥市八校2023-2024学年八年级上学期12月考试数学试题
辽宁省营口市大石桥市八校2023-2024学年八年级上学期12月考试数学试题广东省汕头市金平区2022-2023学年八年级上学期期末数学试题甘肃省定西市安定区思源实验学校2022-2023学年八年级上学期期末考试数学试题(已下线)专题04 全等三角形模型训练(6类经典模型+优选提升)-【好题汇编】备战2023-2024学年八年级数学上学期期中真题分类汇编(人教版)山东省德州市庆云县渤海中学2023-2024学年八年级上学期第一次调研数学试题湖北省武汉市江岸区武汉市培英中学2023-2024学年八年级上学期月考数学试题广东省惠州市第五中学2023-2024学年八年级上学期期中数学试题(已下线)12.3(培优课)倍长中线(题型精讲精练)-【题型分类精粹】2023-2024学年八年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)广东省珠海市香洲区立才学校2023-2024学年八年级上学期月考数学试题(已下线)猜想06 平行线的证明和三角形内角和定理(易错必刷36题9种题型)-2023-2024学年八年级数学上学期期末考点大串讲(北师大版)(已下线)专题02 三角形全等的性质与判定、角平分线之八大题型-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(人教版)山东省德州市宁津县第一实验中学2023-2024学年八年级上学期10月月考数学试题(已下线)专题04 全等三角形培优综合专项训练(旋转模型)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(广东专用)(已下线)专题10 平行线的证明(七种考法)-【好题汇编】备战2023-2024学年八年级数学上学期期末真题分类汇编(北师大版)(已下线)清单03 全等三角形经典模型(9种题型解读(40题))-2023-2024学年八年级数学上学期期末考点大串讲(苏科版)
名校
8 . 如图,在
中,
,
.
的周长为5,则
的周长是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8418a0431bcc57ac8666dfb9a1203b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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3卷引用:辽宁省辽阳市宏伟区2023-2024学年八年级下学期期中数学试题
9 . 如图,在
中,
,分别以点A,B为圆心,大于
长为半径画弧,两弧相交于M,N两点,画直线
,与
交于点D,与
交于点E,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/419fac88-5282-461d-9273-f4958886a1f8.png?resizew=125)
(1)由作图可知,直线
是线段
的________
(2)当
,
时,求
的周长;
(3)若
的度数是
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/419fac88-5282-461d-9273-f4958886a1f8.png?resizew=125)
(1)由作图可知,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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10 . 【问题初探】
在解决“如图1,在
中,
于D,若
,求证:
”时,有两名同学给出了不同的解答思路:
①如图2,小芳从条件入手,采用“截长补短”法,在
上截取
,连接
,从而解决问题.
②如图3,小亮从结论出发,作
的垂直平分线交
于点E,连接
,从而解决问题.
(1)请选择一名同学的解答思路,写出解答过程.
【迁移应用】
(2)如图,线段
于E,点F,G分别为
上两点,且
,
.求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/b23db367-944d-4dc9-b7fd-1af063612d82.png?resizew=536)
在解决“如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50cd37d7ac7f529c36ea42fab6cd20d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dc4d22c2c289f6d4494b9c2be84407.png)
①如图2,小芳从条件入手,采用“截长补短”法,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f94cb32b388456ab9203e8d8b5309e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②如图3,小亮从结论出发,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(1)请选择一名同学的解答思路,写出解答过程.
【迁移应用】
(2)如图,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dad1f58af0e8cb85dd1bfa7df597b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1e87f7330218e72a762d5298e692a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a09d34da0839977ecc415367f69b86.png)
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