如图,
,
分别交
,
于点
,
,
,
平分
交
于点
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235a46f917a962ab23ca558a9a957aa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4dd47d838804e49cc5bec8db349d1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
更新时间:2024-04-09 14:49:41
|
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解答题-问答题
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适中
(0.65)
【推荐2】如图,已知
,
.点
是射线
上一动点(与点
不重合),
,
分别平分
和
交射线
于点E,F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/db77f39f-3b2f-4ebf-a63d-d4aa27ebe5d9.png?resizew=205)
(1)求
的度数,若
,请直接用含
的式子表示
;
(2)随着点
的运动,设
,
,
与
之间的数量关系是否改变?若不改变,请求出此数量关系;若改变,请说明理由;
(3)当
时,请直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e702e136211878dce558e0457f15df63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172766b458ea1e95ab1f5cd70bab7463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf7cc67acfa50ef6b21d9aa379e604a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/db77f39f-3b2f-4ebf-a63d-d4aa27ebe5d9.png?resizew=205)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb3748300134501953d6b1c3a905026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb3748300134501953d6b1c3a905026.png)
(2)随着点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa26fadeee2becc192fa53d778445d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd30d6cae3ff7efb4af16f32fbb1c175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad561d77d63aeeaf6b2f3d13079853a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
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名校
【推荐1】如图1和图2,矩形ABCD中,E是AD的中点,P是BC上一点,AF∥PD,∠FPE=∠DPE.
(1)作射线PE交直线AF于点G,如图1.
①求证:AG=DP;
②若点F在AD下方,AF=2,PF=7,求DP的长.
(2)若点F在AD上方,如图2,直接写出PD,AF,PF的等量关系.
(1)作射线PE交直线AF于点G,如图1.
①求证:AG=DP;
②若点F在AD下方,AF=2,PF=7,求DP的长.
(2)若点F在AD上方,如图2,直接写出PD,AF,PF的等量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/640a020a-94d5-4892-8b86-594f91e19774.png?resizew=261)
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解答题-问答题
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【推荐2】当光线经过镜面反射时,入射光线、反射光线与镜面所夹的角对应相等.请用这一结论解答下列问题.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958742805168128/2959358443225088/STEM/a91cb609-9922-4648-b10b-d2cea22f3682.png?resizew=474)
(1)如图1,入射光线AB经过平面镜OM与ON反射后的反射光线是CD,若CD∥AB,则∠MON的度数为______.
(2)如图2是一种利用平面镜反射,放大微小变化的装置.手柄BP上的点C处安装一平面镜,BP与屏幕MN的交点为D,从A点发出的光束经平面镜C反射后,在MN上形成一个光点E.已知当AB⊥BP,MN⊥BP时,AB=25,BC=16,DE=50.
①求BD的长.
②将手柄BP在原有位置绕点B按逆时针方向旋转一定角度
得到BP′(如图3),点C的对应点为C′,BP′与MN的交点为D′,从A点发出的光束经平面镜C′反射后,在MN上的光点为E′.若
,则D′E′的长为多少?
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958742805168128/2959358443225088/STEM/a91cb609-9922-4648-b10b-d2cea22f3682.png?resizew=474)
(1)如图1,入射光线AB经过平面镜OM与ON反射后的反射光线是CD,若CD∥AB,则∠MON的度数为______.
(2)如图2是一种利用平面镜反射,放大微小变化的装置.手柄BP上的点C处安装一平面镜,BP与屏幕MN的交点为D,从A点发出的光束经平面镜C反射后,在MN上形成一个光点E.已知当AB⊥BP,MN⊥BP时,AB=25,BC=16,DE=50.
①求BD的长.
②将手柄BP在原有位置绕点B按逆时针方向旋转一定角度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6281da863a4f7845b5675160b8838b12.png)
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