名校
1 . 综合与实践:如图1,在正方形
中,连接对角线
,点O是
的中点,点E是线段
上任意一点(不与点A,O重合),连接
、
.过点E作
交直线
于点F.
与
的数量关系,并说明理由;
(2)如图1,求证:
;
(3)如图2,当E在线段
上时(不与点C,O重合),
交
延长线于点F,保持其余条件不变,直接写出线段
、
、
之间的数量关系.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8cbbe3a63c42444d4084e7103321346.png)
(3)如图2,当E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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2023七年级下·浙江·专题练习
2 . 如图,直线
,一副三角尺(
)按如图①放置,其中点E在直线
上,点B,C均在直线
上,且
平分
.
的度数.
(2)如图②,若将三角形
绕点B以每秒3度的速度按逆时针方向旋转(A,C的对应点分别为F,G),设旋转时间为t(s)(
).
①在旋转过程中,若边
,求t的值.
②若在三角形
绕点B旋转的同时,三角形
绕点E以每秒2度的速度按顺时针方向旋转(C,D的对应点为H,K).请直接写出当边
时t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684b5f952ac5a3645cf97339d3554e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a6dc067c8cab80a8f13cd9f8be957e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474c0dc8c11624c4997e48b143bb09a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c62f1dc41e69d2cd99a6483d06eea820.png)
(2)如图②,若将三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58ee420372a1d93dd6d4c18f92908cc.png)
①在旋转过程中,若边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5badfd5a77c3fd14485acb8c378593b4.png)
②若在三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be799f65f726878fab27502a53b2ed61.png)
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今日更新
|
85次组卷
|
6卷引用:浙江省杭州市天杭实验中学2022-2023学年下学期七年级期中考试数学试题
浙江省杭州市天杭实验中学2022-2023学年下学期七年级期中考试数学试题浙江省绍兴市柯桥区2023-2024学年七年级下学期期中数学试题(已下线)第4课 平行线的性质-2022-2023学年七年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(浙教版)浙江省金华市东阳市江北初级中学等四校联考2022-2023学年七年级下学期期末数学试题2023年浙江省金华市 东阳市横店第三初级中学模拟预测数学模拟预测题(已下线)专题07 浙江省各地市七下期末试卷简答题压轴题选练【好题汇编】-备战2023-2024学年七年级数学下学期期末真题分类汇编(浙教版)
3 . 数学活动课上,同学们利用全等三角形的学习经验,对以
和
为腰的等腰三角形
,从特殊情形到一般情形进行如下探究:
【独立思考】(1)如图1,
,即△ABC为等边三角形
,D,E分别是
上的点,且
.
①求证:
;
②求
的度数;
【实践探究】(2)如图2,在等腰
中,
,点D是
上的点,过点B作
于点E.若
,猜想线段
和
的数量关系,并说明理由;
【问题拓展】(3)如图3,在等腰
中,
,D,E分别是
上的点,且
,当
的值最小时,求
的度数.
![](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/7bef5239ddbb0972700ce01daf9ee7cf.png)
【独立思考】(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa49835cb36d11ba406fa8cabbecd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
【实践探究】(2)如图2,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffc2a946e72f26a8af584d8ead3a396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【问题拓展】(3)如图3,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84494e057cb7bc129257c4cb962678ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa49835cb36d11ba406fa8cabbecd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24de889b36de076a95076a05f21fa5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
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4 . 综合探究
学习几何时,通常是先用几何的眼光去观察,再用代数的方法去验证.网格是研究几何图形的一种工具,也是培养几何直观的一种方式.
①如图1,点
,
均在格点上,仅用无刻度的直尺找出线段
的中点
(不写画法,保留画图痕迹);
②如图2,点
,
,
均在格点上,仅用无刻度的直尺画出
绕点
逆时针旋转
得到的
(不写画法,保留画图痕迹);
(2)如图3,点
,
,
均在格点上,仅用无刻度的直尺画出
中
的角平分线
(不写画法,保留画图痕迹);
(3)如图4,在
和
中,点
在边
上,且
,连接
.若
,
,
,求
的长.
学习几何时,通常是先用几何的眼光去观察,再用代数的方法去验证.网格是研究几何图形的一种工具,也是培养几何直观的一种方式.
①如图1,点
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②如图2,点
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cf39c4552ecb2b659f052dc5c0f5eb.png)
(2)如图3,点
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d61f3debc2fba33c47058f372e159b60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7164ffade035fe8d9910512dfa5bb3f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571508bc4c42f2a2b2b223f871a6b155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0175dc2b94c0825fc250da0a2ba648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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5 . 如图,在
中,
,
,O为
的中点,将
绕点O顺时针旋转得到
,D、E分别在边
和
的延长线上,连接
,若
,则
的面积是( )
![](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/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716189b906950b7e8ee499e9b04f5b2c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 如图,在四边形
中,对角线
相交于点O,
,
,若
,则
的值为 __________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4271304891471e068ff6c16f609a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb262f3529a3e84959fe594b6628c77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736956fc97876753d76caedd8a3a1a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d1be9b1e742b25e355af14502549cb.png)
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7 . 如图,长方形
中,
,
,动点P从点D出发,沿
向终点A以
的速度移动,动点Q从点A出发沿
向终点C以
的速度移动,如果P、Q分别从D、A同时出发,其中一个动点到达终点,另一个动点也随之停止.
(1)若经过x秒,用x的代数式表示
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524f25e1eedbfe399f7f42db890ab89a.png)
__________
;
(2)经过____________________ 秒时,以A、P、Q为顶点的三角形面积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6850a299395c314b8f8f2f8ca50c9895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee5bd6f04872ef8d3d833d0e2056161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cc6293cfedec30b124ece908c4c438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e5acdedbab4bba6a4f5defc72c70b6.png)
(1)若经过x秒,用x的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524f25e1eedbfe399f7f42db890ab89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c258d2be23084686379c3c279f54ac.png)
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8 . 若关于
的一元二次方程
的根均为整数,则称方程为“快乐方程”.通过计算发现,任何一个“快乐方程”的判别式
一定为完全平方数.现规定
为该“快乐方程”的“快乐数”.例如“快乐方程”
,的两根均为整数,其“快乐数”
,若有另一个“快乐方程”
的“快乐数”
,且满足
,则称
与
互为“开心数”.
(1)“快乐方程”
的“快乐数”为________;
(2)若关于
的一元二次方程
(
为整数,且
)是“快乐方程”,求
的值,并求该方程的“快乐数”;
(3)若关于
的一元二次方程
与
(
、
均为整数)都是“快乐方程”,且其“快乐数”互为“开心数”,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807d62d0b5623b3bd3cb285560bf8436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2321c8b7bfe7289f553f5d0ae6660bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb270d63e9829b81a402267c5255d9f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3898b62d3fbcb61afb6bc1e9b910f564.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bdb54f552b1245de946bd4acf428804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb2c987da7795c6778a5050f51ae831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4da2bddf67c2edebf870f478996da8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed43630938b701d907ed9e3eb8e5225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d14bba67ef04e0cb697e18a2ca802135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4da2bddf67c2edebf870f478996da8.png)
(1)“快乐方程”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8034dddd265a186e29172623e3b9eadf.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f431f2ba49473d5bf26535d9fd1f145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580fb854db673c1d33f10df705c6525.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c846f16f1c2bdda4bfdbaf1e7d02466b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9800629e744a023ecb8d5a5fcb2f8bea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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9 . 在苏科版义务教育教科书数学七下曾经研究过双内角平分线的夹角和内外角平分线夹角问题.聪聪在研究完上面的问题后,对这类问题进行了深入的研究,他的研究过程如下:
中,
、
的角平分线交于点P,若
.则
______;
(2)【问题推广】如图2,在
中,
的角平分线与
的外角
的角平分线交于点P,若
,求
的度数.
(3)如图3,在
中,
、
的角平分线交于点P,将
沿DE折叠使得点A与点P重合,若
,则
______;
(4)【拓展提升】在四边形
中,
,点F在直线
上运动(点F不与E,D两点重合),连接
,
、
的角平分线交于点Q,若
,
,求
和
,
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6fede7d2da3ccecf3f9d32a10346c3.png)
(2)【问题推广】如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28537fd3056afc85c8f671e0756666f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67caa956042197d36d651c4ec1a75b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084e6a1b28da99033ae0131d8cf76fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1de94901207fc22febd4bf4760fd970.png)
(4)【拓展提升】在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077956e5f55232814d1a077af264590e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd65cdb5bb8f4cfb8109f60878406ee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8946331b0a9d86e1a9c78797f3021455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fae1ad7f6330b4dc46ef557bbfc6e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb65bee4fb8c2cbdd36e318cd652f928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300d3ec6447250bb25915ae86873929a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a1ccfa8c18e8a1192519706d3c32d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8da4177449887fa1e3c98fe81570b7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595522dfc96cc92f1d84ea0f298bb738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
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名校
10 . 如图,直线
上有两点
、
,分别引两条射线
、
,
,
,射线
、
分别绕
点,
点以
度/秒和
度/秒的速度同时顺时针转动,在射线
转动一周的时间内,使得
与
平行所有满足条件的时间![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb8ac3f3b2598a84e0bf85b713ecdb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348e40cf88acadb42e0d696fdc30dd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
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