如图,在正方形
中,
为线段
上的动点(不含端点
),将
沿着
翻折得到
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/c67f14e1-108f-4568-a7c0-bd33e7b295a4.png?resizew=553)
(1)如图1,当
,求
长;
(2)如图2,
为线段
上的点,当
时,求点
由
到
的运动过程中,线段
扫过的图形与
重叠部分的面积;
(3)如图3,
在
上,连接
,将
沿着
翻折得到
,连结
,问是否存在点
,使得
与
相似?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3775a910dc0f94a03a7444398f7b49b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd51caff8d6cd6d3478fb4659789d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ce15d6393bd3bfd96fa6837d70d872.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/c67f14e1-108f-4568-a7c0-bd33e7b295a4.png?resizew=553)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79fcc16580d7ceeff26780b4ccb014c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b538e72e09c41af626f1c626f4752d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/72a4553af74c05de69b65a5faffaf39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7048a2fee2ba929f1c5b0e61aadd88ed.png)
(3)如图3,
![](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/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13801b318bb3efbd62f34c1e814e88b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1651c45381f183a3caa2a201bf57ecc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbac5db9900d255c00922812b40fcd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52cb9079f5ff1ef044a4524b25d6f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10181c7da1ebde87bf7b9c5fcde65c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
更新时间:2020-04-17 09:13:34
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,
是等边三角形,
,射线
,点D(不与点B重合)为射线BN上一动点,连接
,将线段
绕点A逆时计旋转
得到线段
,连接
,延长
交射线
于点F.
;
(2)问线段
的长是否随着点D的移动而发生变化?若不变,求出
的长;若要变,说明理由;
(3)当点D在射线
上移动时,过点E作
,垂足为点P,设
,求
的长(用含m的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bae5203f4b4acf23779114b3466e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b6365fc0aa8fe555744500b7136a2b.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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa80cfd38f59e5cbbb30628d03113689.png)
(2)问线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)当点D在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588a0322039637a7904adf97f07b526f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c4a6228026eb423be917b19e202794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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解答题-证明题
|
较难
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【推荐2】如图,点O是等边
内一点,将
绕点C按顺时针方向旋转
得
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/283bb8a8-081a-497c-9ee1-7a3cc196af48.png?resizew=154)
(1)求证:
是等边三角形;
(2)若
,
,
,试判定
的形状,并说明理由;
(3)若
,
,请探究:当
为多少度时,
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/283bb8a8-081a-497c-9ee1-7a3cc196af48.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2d3f02cb9007cd4a90ea30f6dd8181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd3fd00798e7ec50afafe7fa7a4f42e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b42602dabcdc7bdaba0ee0af37d71f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037ded7b2c5361b4aae67dd0a81da29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbec8352ce3dbfbf3b173045d0ba8f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
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(0.4)
【推荐1】
如图1,正方形
和正方形,
连接
,当
时,
与
的关系是?
如图2,将正方形
绕点
顺时针旋转,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a18f0a7f309f7309b9eff38c69b39e8.png)
中结论是否仍然成立?若成立,请给出证明:若不成立,请说明理由;
已知
,在旋转过程中,若直线
平分
,请画出相应的图形,并写出其中一种情形时
长的思路.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178a27068cf5517ad64f211af10256ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7a0bfc593a8a33b6cade6ba213904c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a18f0a7f309f7309b9eff38c69b39e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23a18c406889b7b8372c4ce6e0b70e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447705566953472/2447906204983296/STEM/0a220b4d-612f-4c5d-9d97-3252f649a308.png)
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解题方法
【推荐2】如图,在正方形ABCD中,点M是边BC上的一点(不与B、C重合),点N在边CD延长线上,且满足
,连接MN,AC,MN与边AD交于点E.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712450042519552/2715825725513728/STEM/33c49072-e36c-4fe5-b96c-bebf8df2a162.png)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
(2)如果
,求证:
;
(3)MN交AC点O,若
,则
________(直接写答案、用含k的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cb59543ccf42b37ebce3f67416e561.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712450042519552/2715825725513728/STEM/33c49072-e36c-4fe5-b96c-bebf8df2a162.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af1cbf20494ef267eaaf6fc43b1f2ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1dcc57798ec85039895204050173a1.png)
(3)MN交AC点O,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae12145882a18d36833bd22413d45849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/161f9f827a480a0a7c658614d9e3ffc1.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图1,已知
,点
在射线
上,且
.以点
为圆心,
为半径作
,交直线
于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/154de00f-15bf-42f0-bd92-14dd50153795.png?resizew=450)
(1)当
与
只有两个交点时,
的取值范围是________;
(2)当
时,将射线
绕点
按顺时针方向旋转
.
①当
为多少时,射线
与
相切;
②如图2,射线
与
交于
,
两点,若
,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.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/9466d03bc916a9169eaf39863d59fceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e1b2d25e575038885c5eddf1ddb229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/154de00f-15bf-42f0-bd92-14dd50153795.png?resizew=450)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f65173f8f453c4198cbfab09bb19c51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②如图2,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3273542166cf457e498147d57d3c9ae0.png)
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解答题-证明题
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(0.4)
名校
【推荐2】如图,在
中,
,点E在斜边
上,以
为直径的⊙O与
交于点D,
平分
.
![](https://img.xkw.com/dksih/QBM/2021/9/10/2805231363653632/2805787499110400/STEM/8f4cd551-9ba9-456c-9033-b6ecac9086ee.png)
(1)求证:
为⊙O的切线
(2)若
,
,求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/2021/9/10/2805231363653632/2805787499110400/STEM/8f4cd551-9ba9-456c-9033-b6ecac9086ee.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,已知A(0,2)、B(6,4)、E(a,0)、F(a+1,0),求a为何值时,四边形ABEF周长最小?请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/3/28/2687866542309376/2688222486552576/STEM/8f353c13-5f5f-4408-b366-2a703bbf75a5.png?resizew=224)
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【推荐2】【问题情境】在数学活动课上,同学们在课上用两张矩形纸片进行探究活动.小组同学准备了两张矩形纸片
和
,其中
,
,将它们按如图1所示的方式放置,点E,G分别落在
,
边上时,点E,G恰好为边
,
的中点.然后将矩形纸片
绕点B按顺时针方向旋转,旋转角为
,连接
与
.
(1)如图2所示,当
时,小组成员发现
与
存在的数量关系为_________;位置关系为_________;
【探索猜想】
(2)如图3所示,当
时,(1)中发现的结论是否仍然成立?请说明理由;
【拓展延伸】
(3)在矩形
的旋转过程中,
交
于点P,
交
于点O,连接
,
,
是否为定值;如果是,请直接写出此定值,如果不是,请你说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(1)如图2所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
【探索猜想】
(2)如图3所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b5ea2fc43b19ca043581eb94197234.png)
【拓展延伸】
(3)在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b348cef81feb80ed7e79a5d9e67ef48d.png)
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