题型:解答题-证明题
难度:0.65
引用次数:281
题号:22267453
如图1,直线
与直线
,
分别交于点E,F,
与
互补.
与直线
的位置关系,并说明理由;
(2)如图2,
与
的平分线交于点P,
与
交于点G,点H是
上一点,且
,求证:
;
(3)如图3,在(2)的条件下,连接
,K是
上一点,使
,作
平分
,问
的大小是否发生变化?若不变,请求出其值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/0af253831c06acfe352ac7827c08a925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05cbf5c2be437d5794e83deca8a53e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f68e4414c9ab464bf433385c03705f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb1de78a83c3a206ed3a3949e313f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e95571ddc57113018cab89b50c12128.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5eddb6d5a5df354aa489c3e10b307b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e00216eb8b0f3b8c1e0713c98fa4dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dce75683961a8db6056e9b478647926b.png)
更新时间:2024-03-27 22:06:11
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【推荐1】如图,在
中,D是AB边上一点,H是BC边上一点,过点H作
交AB于点F,E是AC边上一点,连结DE,
.
(2)若DE平分
,
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93eb2cfa0195f7194b0443259edbfd33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ddc1f7e2fff6c41ecd44b0fc7592e0.png)
(2)若DE平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c769090b5a79d9d21f7e9b6a95468b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965921179740a4e028ac29f36f96c335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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名校
【推荐1】光线照射到镜面会产生反射现象,由光学知识,入射光线与镜面的夹角和反射光线与镜面的夹角相等,例如:在图1中,有
.
与镜子
互相平行,请判断入射光线
与反射光线
的位置关系,并说明理由;
(2)如图3,有一口井,已知入射光线
与水平线
的夹角为
,问如何放置平面镜
,可使反射光线
正好垂直照射到井底?(即求
与水平线
的夹角
)
(3)如图4,直线
上有A、C两点,分别引两条射线
、
,
,
,射线
、
分别绕A点、C点以1度/秒和4度/秒的速度同时顺时针转动,设时间为t,在射线
转动一周的时间内,是否存在某时刻,使得
与
平行?若存在,直接写出 所有满足条件的时间t.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图3,有一口井,已知入射光线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588abe296d53dbbce91d0c693322bf8c.png)
(3)如图4,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/bbb38e3120e2ebfbbac8a7aa6d43f1b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e855c354ab71fdc3c46cd6f82ced40.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,AB∥CD,点E在直线AB上,点F在直线CD上,直线EO,FO相交于直线AB,CD之间的一点O.
(1)借助三角尺过点O画直线MN,使MN∥CD.
(2)直线MN与AB平行吗?为什么?
(3)试判断∠BEO,∠DFO,∠EOF之间的关系,并说明理由.
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解答题-证明题
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【推荐1】古希腊七贤之一,著名哲学家泰勒斯(
,公元前6世纪)最早从拼图实践中发现了“三角形内角和等
”,但这种发现完全是经验性的,泰勒斯并没有给出严格的证明.之后欧几里得利用辅助平行线和延长线,通过一组同位角和内错角证明了该定理.请同学们帮助欧几里得将证明过程补充完整.
(1)已知:如图1,在
中,
求证:
.
证明:延长线段
至点F,并过点C作
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
(已作),
________
(两直线平行,内错角相等),
________
(两直线平行,同位角相等).
________________(平角的定义),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
(等量代换).
【实践运用】
(2)如图2,线段
、
相交于点O,连接
、
,试证明:
.
【拓展提升】
(3)①如图3,
、
分别平分
、
,若
,
,则
的度数为________°.
②如图4,直线
平分
,
平分
,若
,
,则
的度数为________°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ffc7a599a38ba43c46d8c2607e4dac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/4/69ebd887-455d-4cf7-ba79-11b6ff68b965.png?resizew=573)
(1)已知:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a907b8fc2f768e0d200f58e4d962b988.png)
证明:延长线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6dd1ebbb85baadae4d5c8862b9619eb.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32d041058f48c2c3c12b6fda4f7675e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27ad55644445ec4f76f8b22a46355ad.png)
【实践运用】
(2)如图2,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6436b9c2493203d008064460c3c487.png)
【拓展提升】
(3)①如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ceb58cbf991bd0e7f3d005fa8c305b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136ae9d951dc61194b3563f9290b1450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
②如图4,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d598f4a17ac14970ade9f381e9aee970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ceb58cbf991bd0e7f3d005fa8c305b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136ae9d951dc61194b3563f9290b1450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
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【推荐2】如图,AD为△ABC的中线,BE为△ABD的中线,
(1)若∠ABE=25°,∠BAD=50°,则∠BED的度数是 度.
(2)在△ADC中过点C作AD边上的高CH.
(3)若△ABC的面积为60,BD=5,求点E到BC边的距离.
(1)若∠ABE=25°,∠BAD=50°,则∠BED的度数是 度.
(2)在△ADC中过点C作AD边上的高CH.
(3)若△ABC的面积为60,BD=5,求点E到BC边的距离.
![](https://img.xkw.com/dksih/QBM/2018/12/24/2103778194776064/2106649402638336/STEM/8d88dbd1813149538edd5618af231574.png?resizew=189)
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