如图1,在
中,
,
,D,E分别为
的中点,将
绕点C逆时针方向旋转得到
(如图2),使直线
恰好过点B,连接
.
与
的位置关系,并说明理由;
(2)求
的长;
(3)若将
绕点C逆时针方向旋转一周,当直线
过
的一个顶点时,请直接写出
长的其它所有值.
![](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/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfdd87da851a3d6bbb80681b291d2a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cece895cbddf9d1f37f75e3b6346edda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
(3)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cece895cbddf9d1f37f75e3b6346edda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
23-24九年级上·山东日照·期末 查看更多[4]
山东省日照市岚山区2023-2024学年九年级上学期期末数学试题(已下线)第3章 图形的平移与旋转(单元测试·拔尖卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)山东省日照市岚山区岚山区教育科学研究中心2023-2024学年九年级上学期期末数学试题(已下线)第三章第04讲 难点探究专题:旋转中的常见类型(5类热点题型讲练)-【帮课堂】2023-2024学年八年级数学下册同步学与练(北师大版)
更新时间:2024-04-15 09:11:54
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【推荐1】如图,点O为直线AB上一点,∠BOC=40°,OD平分∠AOC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/5f89734d-644d-4b50-b0ce-d4bb989ad491.png?resizew=369)
(1)求∠AOD的度数;
(2)作射线OE,使∠BOE=
∠COE,求∠COE的度数;
(3)在(2)的条件下,作∠FOH=90°,使射线OH在∠BOE的内部,且∠DOF=3∠BOH,直接写出∠AOH的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/5f89734d-644d-4b50-b0ce-d4bb989ad491.png?resizew=369)
(1)求∠AOD的度数;
(2)作射线OE,使∠BOE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(3)在(2)的条件下,作∠FOH=90°,使射线OH在∠BOE的内部,且∠DOF=3∠BOH,直接写出∠AOH的度数.
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【推荐2】在
和
中,
,
,
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/1a26f640-a071-4e2c-8caa-c3a00e84112e.png?resizew=532)
(1)当
、
、
在一条直线上时,
①如图1,当
、
、
在同一直线上时,求
;
②如图2,当
、
、
不在同一直线上时,点
是
的中点,连接
,求
;
(2)如图3,当
、
、
不在一条直线上时,且
,连接
,点
是
的中点,连接
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd75c2244c18120b8fc35d5d309ab66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686171942bd7698035016c732db43b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf7dbe6ce9238254a4172d3cda7230d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/1a26f640-a071-4e2c-8caa-c3a00e84112e.png?resizew=532)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
②如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/fc272ccfc049e40b5005f37c6a3115f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
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【推荐3】如图,AB CD,垂足为 O,点 P、Q 分别在射线 OC、OA 上运动(点 P、Q 都不与点 O 重合),QE 是∠AQP 的平分线.
①当∠PQB=60°时,∠PHE= °;
②随着点 P、Q 分别在 OC、OA 的运动,∠PHE 的大小是否是定值?如果是定值,请求出∠PHE 的度数;如果不是定值,请说明理由;
(2)如图 2,若 QE 所在直线交∠QPC 的平分线于点 E 时,将△EFG 沿 FG 折叠,使点 E 落在四边形PFGQ 内点E′ 的位置,猜测∠PFE′与∠QGE′ 之间的数量关系,并说明理由.
①当∠PQB=60°时,∠PHE= °;
②随着点 P、Q 分别在 OC、OA 的运动,∠PHE 的大小是否是定值?如果是定值,请求出∠PHE 的度数;如果不是定值,请说明理由;
(2)如图 2,若 QE 所在直线交∠QPC 的平分线于点 E 时,将△EFG 沿 FG 折叠,使点 E 落在四边形PFGQ 内点E′ 的位置,猜测∠PFE′与∠QGE′ 之间的数量关系,并说明理由.
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【推荐1】已知:△ABC,△CDE中,∠ACB=∠DCE=90°,AC=BC=6,CD=CE=4,△CDE可以绕点C旋转,作直线AD、直线BE,当它们有交点时.设相交点为H.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728048306003968/2779476939776000/STEM/6144245a-aa58-4ed6-a824-bfcafa32b461.png)
(1)当△CDE转到图1位置时,求证:①AD=BE;②AD⊥BE;
(2)△CDE可以绕点C旋转的过程中,连接AE,BD.猜想AE2+BD2的值是否发生变化(直接写出结论,不用证明)?直接写出当BD=8时,AE的长;
(3)△CDE可以绕点C旋转的过程中,直接写出当∠CBD=30°时,AE2的值.
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728048306003968/2779476939776000/STEM/6144245a-aa58-4ed6-a824-bfcafa32b461.png)
(1)当△CDE转到图1位置时,求证:①AD=BE;②AD⊥BE;
(2)△CDE可以绕点C旋转的过程中,连接AE,BD.猜想AE2+BD2的值是否发生变化(直接写出结论,不用证明)?直接写出当BD=8时,AE的长;
(3)△CDE可以绕点C旋转的过程中,直接写出当∠CBD=30°时,AE2的值.
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【推荐2】如图,
内接于⊙O,
,弦CD与AB交于E,
,过A作
于F.
(1)猜想AE与CE的数量关系:______.
(2)①判断AC与BD的位置关系,并说明理由;
②求证:
;
(3)若
,求tan∠BDC的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf23e73ae2a15c04bbed3981cb8e511.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/fb643c95-13cb-459f-9c6b-a69b5388b14a.png?resizew=147)
(1)猜想AE与CE的数量关系:______.
(2)①判断AC与BD的位置关系,并说明理由;
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e8fd0a0360d05730afee9c4894ec42.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef19ff7723cac1e731db5a8519303af4.png)
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【推荐1】如图1,
都是等腰直角三角形,
,且
,点
在
上,连接
.
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301798878281728/2302028809838592/STEM/7ce35bead6bd41209f45c161f54adf02.png?resizew=293)
(1)如果
,①求
;②若
是关于
的方程
的两个实数根,求
的值;
(2)如图2,将
绕点
逆时针旋转,使
,连接
,求五边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2595731c32e671b203aebe5a07c1d611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f104da7a1a09cbac1b94eef06825912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fbe24ce88c40c2ae88d63d8a0458cd.png)
![](https://img.xkw.com/dksih/QBM/2019/9/30/2301798878281728/2302028809838592/STEM/7ce35bead6bd41209f45c161f54adf02.png?resizew=293)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e208452fde94f22b05f291dd28e4e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d701d16d9f318ee8fa779f5b961d64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6150565c76b3b2f826ba26ab79d48ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
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【推荐2】如图,
是
的直径,C,D是
上两点,
为
的切线,且
,垂足是E,连接
交
于点F.
平分
;
(2)求证:
;
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b94d4429884006d7322b175b3dc6e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.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/a852c13de65877be1f43ac1f88f179d7.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68bab655f728f928310b5c71f9eae18.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1fa02a7286a78b986a8f8f3a8c03ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462a35893afcd7774f5183e738ad506c.png)
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【推荐1】数学实践活动,是一种非常有效的学习方式.通过活动可以激发我们的学习兴趣,提高动手动脑能力,拓展思推空间,丰富数学体验.让我们一起动手来折一折、转一转、剪一剪,体会活动带给我们的乐趣.
折一折:将正方形纸片
折叠,使边
、
都落在对角线
上,展开得折痕
、
,连接
,如图1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/afcff72d-44dd-4331-a382-2374af47178a.png?resizew=485)
转一转:将图1中的
绕点
旋转,使它的两边分别交边
、
于点
、
,连接
,如图2.
剪一剪:将图3中的正方形纸片沿对角线
剪开,如图4.
(1)
______
,写出图中两个等腰三角形:______(不需要添加字母);
(2)线段
、
、
之间的数量关系为______;
(3)连接正方形对角线
,若图2中的
的边
、
分别交对角线
于点
、点
.如图3,求
的值;
(4)求证:
.
折一折:将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/afcff72d-44dd-4331-a382-2374af47178a.png?resizew=485)
转一转:将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/49b50357a6545cae8348e3059312f520.png)
剪一剪:将图3中的正方形纸片沿对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a02295b56d4f94521133b91e1403e4.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)连接正方形对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af4ea989fa0a89c7fef51255a92116b.png)
(4)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530706ea13c440b2a6ace1967043e3fb.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐2】如图,△ABC中,
,
,边BA绕点B顺时针旋转
角得到线段BP,连接PA,PC,过点P作
于点D.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974844814188544/2977850502283264/STEM/1950d9fa-f43d-47a5-9398-db139ad1b4fc.png?resizew=623)
(1)如图1,若
,
______°;
(2)如图2,若
,求∠DPC的度数;
(3)如图3,若
,依题意补全图,并求出∠DPC的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2951b9f77413d5f062acb300b09de1f6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974844814188544/2977850502283264/STEM/1950d9fa-f43d-47a5-9398-db139ad1b4fc.png?resizew=623)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d40a209bb65f531d6fab600d228d39.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c1c29196e61a52b63d9d6cd8184256.png)
您最近一年使用:0次