(1)问题情景:如图1,
,
,
,求
的度数.在横线上填上相应的数值(在答题卡上).
![](https://img.xkw.com/dksih/QBM/2020/7/29/2516492888719360/2517019664531456/STEM/7e5193a692134de584108c00182475c9.png?resizew=583)
解:如图2,过点
作
,
∵
,∴
.
∴
.
__________
.
∵
,
,
∴
,
___________![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∴
___________![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
问题迁移:(2)如图3,
,已知点
、
、
在射线
上,当点
在
、
两点之间运动时,
,
,求
与
、
之间有何数量关系?
请说明理由.
(3)在(2)的条件下,如果点
在
、
两点外侧运动时(点
与点
、
、
三点不重合),请你直接写出
与
、
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5560c1b5357660d8d94630a94c589b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d755e3beaf392e1fd8dc4061c240228b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://img.xkw.com/dksih/QBM/2020/7/29/2516492888719360/2517019664531456/STEM/7e5193a692134de584108c00182475c9.png?resizew=583)
解:如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eecfa3e9be8e82ff3c3270b7283a583.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fad91aabb31daa3223b555db5d8275f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df19539c9d2c5178ea852c0fb04be7e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de53e7a62eef9da3527ee335d1c01b7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5560c1b5357660d8d94630a94c589b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d755e3beaf392e1fd8dc4061c240228b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f2737d3b2b0bbd5114b44a4655c37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e917c37620d73723d7b5ff671170bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86926ed61869499106e8909f299c5f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
问题迁移:(2)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.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/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.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/43f9b3fd8dc6d9fef629c89fbdb16753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89156ad4654e5137a7f3627de6534ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd601617f0ab200d5c80c37ab41d7323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
请说明理由.
(3)在(2)的条件下,如果点
![](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/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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd601617f0ab200d5c80c37ab41d7323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
更新时间:2020-07-30 13:52:31
|
【知识点】 根据平行线的性质探究角的关系解读
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】我们通常把图1、图2 中的点 E 称为拐点,解决平行线中有关拐点问题的方法,一般是过拐点作平行线
,直接 写出
的数量关系;
【变式拓展】如图2,保持
,当点 E 在
的右上方时,
的数量关系有变化吗? 写出结论,并证明你的猜想;
【学科融合】图3是一探照灯灯碗的纵剖面,在焦点O 处发出的光线经灯碗(点C 除外)反射后均沿与
平行的方向射出.入射光线
的反射光线为
,
,若入射光线
经灯碗反射后沿
射出,且
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676c504cd89b3f5c1ff290fed2c02e1b.png)
【变式拓展】如图2,保持
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676c504cd89b3f5c1ff290fed2c02e1b.png)
【学科融合】图3是一探照灯灯碗的纵剖面,在焦点O 处发出的光线经灯碗(点C 除外)反射后均沿与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb49a110acec1e86b8e8969300f0cd2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a112f89cd635e76a835996a4bbb7885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1646bcdf3e246b4dc2609317cf1398ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068996ee2fb6dc9a69cc0a83e98ddfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/19bb5a50-5913-4c7c-a7a3-a2f84a3ec0cf.png?resizew=221)
(1)求证:
;
(2)若
平分
,请直接写出图中所有与
相等的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117878cbd8c00f2aabcdf62b487e2dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/19bb5a50-5913-4c7c-a7a3-a2f84a3ec0cf.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88fe4a86afb4856eca59ca6d5686f912.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
您最近一年使用:0次