已知
是等边三角形,
,点
在线段
上,且
,连接
,求
的长;
(2)如图2,点
是
延长线上一点,
,
交
的外角平分线于点
,求证:
:
(3)如图3,若
,动点
从点
出发,沿射线
方向移动,以
为边在右侧作等边
,取
中点
,连接
,请直接写出
的最小值及此时的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.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/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,点
![](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/cc2b3f06d7405250f14bf75b7668686e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d297ab8f3b68e1617bca4c1e915d28fd.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9d2abf13c2842f58654abf73c6b4ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9d2abf13c2842f58654abf73c6b4ee.png)
更新时间:2024-04-18 12:56:04
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【推荐1】如图,l为河岸(视为直线),要想开一条沟将河里的水从A处引到田地里去,则应从河边l的何处开口才能使水沟最短,找出开口处的位置并说明理由.
![](https://img.xkw.com/dksih/QBM/2017/9/3/1773019354292224/1829339720876032/STEM/49265e93e1504c9b9c8bc8758d0ad6e4.png?resizew=130)
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【推荐2】【综合与实践】
【动手实验】数学课上,老师带领同学们对角的平分线的性质进行探究:
同学们任作一个
,作出
的平分线
.在
上任取一点
,过点
画出
,
的垂线,分别记垂足为
,
,测量
,
.第一小组的测量结果如下:
通过以上测量,你发现了角的平分线的什么性质?
(1)【实验猜想】我们猜想角的平分线有以下性质:______.
(2)【推理证明】请结合图1,利用三角形全等证明这个性质.
如图1,已知:
,点
在
上,
,
,垂足分别为
,
.求证:
.
(3)【定理应用】如图2,点
是
的角平分线上一点,
,垂足为点
,且
,点
是射线
上一动点,求
的最小值.
【动手实验】数学课上,老师带领同学们对角的平分线的性质进行探究:
同学们任作一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.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/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
通过以上测量,你发现了角的平分线的什么性质?
学生 | ![]() | ![]() | 学生 | ![]() | ![]() |
小明 | ![]() | ![]() | 小刚 | ![]() | ![]() |
小红 | ![]() | ![]() | 小丽 | ![]() | ![]() |
(2)【推理证明】请结合图1,利用三角形全等证明这个性质.
如图1,已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1f18cef1745d84a0265246684753bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70aa83794b41e477e7b546ecbe435ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374e2198b495b86b0f8308d28035a3db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/77fdc284-cb31-43fc-9128-3ea7f97be67b.png?resizew=131)
(3)【定理应用】如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0f73b3c63084d9c032802e01f9a168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/f81d90f8-ce9d-4a89-b2d4-6c454b73a6ad.png?resizew=123)
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【推荐1】如图1,正方形
的对角线
,
相交于点O,E是
上一点,连接
,过点A作
,垂足为M,
与
相交于F.
(1)直接写出线段
与
的数量关系;
(2)如图2,若点E在
的延长线上,过点A作
,
交
的延长线于点F,其他条件不变.问(1)中的结论还成立吗?如果成立,请给出证明;如果不成立,说明理由;
(3)如图3,当
时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7e284eac4b90bfb327de768a7beef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(2)如图2,若点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7e284eac4b90bfb327de768a7beef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc7897e3f49075943704f4dbef82e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/c8d095e4-d9ab-4698-b0ce-a632a37eea10.png?resizew=503)
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解题方法
【推荐2】如图,已知:在
中,
,
、
是
的角平分线,交于点O求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b3a93c8785c204386e6384cb3fee61.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/06b09e77-67d5-4c1f-b4d0-2602b380de79.png?resizew=187)
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【推荐1】如图,在
中,
,点
,
,
分别在边
,
,
上,且
,
,连结
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4e0de0c1de0835766b7f627f348c0.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461196810534912/2461964912541696/STEM/d98fe4f434f940c4abf1f5f1b300b6d8.png?resizew=144)
(1)求证:
.
(2)判断
的形状,并说明理由.
(3)若
,当
_______时,
.请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a012fdeed9bae92e4e36e8e6deb6037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4e0de0c1de0835766b7f627f348c0.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461196810534912/2461964912541696/STEM/d98fe4f434f940c4abf1f5f1b300b6d8.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ed70a96ff992f1d2464ed2965486a3.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
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【推荐2】如图1,在四边形ABCD中,DC∥AB,AD=BC,BD平分∠ABC.
![](https://img.xkw.com/dksih/QBM/2016/4/12/1574191599058944/1574191604752384/STEM/e89cb8172e1c42659e3539ead60f7f20.png?resizew=338)
(1)求证:AD=DC;
(2)如图2,在上述条件下,若∠A=∠ABC=60°,过点D作DE⊥AB,过点C作CF⊥BD,垂足分别为E、F,连接EF.判断△DEF的形状并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2016/4/12/1574191599058944/1574191604752384/STEM/e89cb8172e1c42659e3539ead60f7f20.png?resizew=338)
(1)求证:AD=DC;
(2)如图2,在上述条件下,若∠A=∠ABC=60°,过点D作DE⊥AB,过点C作CF⊥BD,垂足分别为E、F,连接EF.判断△DEF的形状并证明你的结论.
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【推荐3】数学活动课上老师出示了如下条件,让同学们自己提出问题并解决.
嘉嘉和淇淇经过讨论后,进行了如下探究。
(1)①如图,若点
与点
重合,即线段
的长度为0,猜测此时线段
之间的数量关系是
. 请你给出
的理由;
②若点
不与点
重合,线段
之间也存在一个数量关系. 请你猜测线段
之间的数量关系,并证明;
(2)若把“
是线段
上的一个动点”改为“
是射线
上的一个动点(不与点
重合,且
”,其他条件都不变,则当点
在线段
的延长线上时,请你用等式表示线段
之间的数量关系(直接写出结果,不需要证明).
如图,在![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
(1)①如图,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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268544817735d20ffbceef3b26db5dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
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/dde983da4828c4631ff782c094d959a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dde983da4828c4631ff782c094d959a2.png)
(2)若把“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8abda526e1bfb191e33bf8d1c83751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dde983da4828c4631ff782c094d959a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/1c5d3382-2429-4485-98a3-8e44f8bed79d.png?resizew=409)
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【推荐1】【教材呈现】下图是华师版八年级上册数学教材96页的部分内容.已知:如图1,OC是∠AOB的平分线,P是OC上任意一点,PD⊥OA,PE⊥OB,垂足分别为点D和点E.求证:PD=PE,图中有两个直角三角形PDO和PEO,只要证明这两个三角形全等便可证得PD=PE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/94bcfb6c-25e4-4ae5-b3d1-dfa2ee9448c7.png?resizew=219)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/107316dc-30f3-455a-b45d-4528e158cd50.png?resizew=219)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/bef580f4-7360-4ac7-bbcf-33fa130eb9be.png?resizew=223)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/1598b51a-e578-4843-9d31-9c5ba6ae77bd.png?resizew=253)
(1)【问题解决】请根据教材分析,结合图①写出证明过程.
(2)【类比探究】如图②,OC是∠AOB的平分线,P是OC上任意一点,点M,N分别在OB和OA上,连接PM和PN,若∠PMO+∠PNO=180°.求证:PM=PN
(3)如图③,
ABC中,BD平分∠ABC交AC于点D,若∠ABC=60°,∠C=45°,DC=
,直接写出
ABD的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/94bcfb6c-25e4-4ae5-b3d1-dfa2ee9448c7.png?resizew=219)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/107316dc-30f3-455a-b45d-4528e158cd50.png?resizew=219)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/bef580f4-7360-4ac7-bbcf-33fa130eb9be.png?resizew=223)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/1598b51a-e578-4843-9d31-9c5ba6ae77bd.png?resizew=253)
(1)【问题解决】请根据教材分析,结合图①写出证明过程.
(2)【类比探究】如图②,OC是∠AOB的平分线,P是OC上任意一点,点M,N分别在OB和OA上,连接PM和PN,若∠PMO+∠PNO=180°.求证:PM=PN
(3)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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解答题-问答题
|
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【推荐2】如图1,四边形
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/daf19ded-c7c7-4390-8a3b-a72bfcb9e781.png?resizew=389)
(1)求线段
的长度;
(2)如图2所示,
是
的平分线,一动点
从点
出发,以每秒
个单位长度的速度沿射线
运动,设点
的运动时间为
秒,当
是等腰三角形时,请求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1844ccba2dad4dbfe0426d7dcd2038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60096d11a222426d712390d3aad75ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33dfaaf03252df863450c2d7a0456711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455db6b32224b203a0817e318025ec09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/daf19ded-c7c7-4390-8a3b-a72bfcb9e781.png?resizew=389)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
(2)如图2所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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