在△ABC中,如图∠BAC=90°,BD平分∠ABC,点E在BC上,DE∥AB,点F在BC上,连结AF,∠C=36°.
![](https://img.xkw.com/dksih/QBM/2019/5/27/2212571264106496/2276281906438145/STEM/4ef12c01ed6c4ad7b50f470dd5a074a9.png?resizew=252)
(1)求∠BDE的度数;
(2)若∠BAF∶∠CAF=2∶3,求证:AF⊥BC.
![](https://img.xkw.com/dksih/QBM/2019/5/27/2212571264106496/2276281906438145/STEM/4ef12c01ed6c4ad7b50f470dd5a074a9.png?resizew=252)
(1)求∠BDE的度数;
(2)若∠BAF∶∠CAF=2∶3,求证:AF⊥BC.
更新时间:2019-08-25 10:50:18
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【推荐1】如图,
,
为
的平分线,
为
的平分线。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/e720f343-e1f3-43ac-a292-d250ef5f0888.png?resizew=152)
(1)
与
平行吗?请你写出说理过程(不必写出依据);
(2)如果
于点B,那么
,请你写出说理过程(不必写出依据).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d781dec45288ea630585adf67f6f3a.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/e720f343-e1f3-43ac-a292-d250ef5f0888.png?resizew=152)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1be642ddd61c3ad26bcbe2dc42e3512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fbbed1dbff0bdf2de260443749e151.png)
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【推荐2】在
中,∠BAC=90°,
,点D为直线BC上一动点(点D不与B,C重合),以AD为直角边在AD右侧作等腰直角三角形ADE(
,
),连接CE.
(1)如图1,当点D在线段BC上时,猜想:BC与CE的位置关系,并说明理由;
(2)如图2,当点D在线段CB的延长线上时,(1)题的结论是否仍然成立?说明理由;
(3)如图3,当点D在线段BC的延长线上时,结论(1)题的结论是否仍然成立?不需要说明理由.
![](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/931b1589d78dd81a3ecac7b9664b3307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
(1)如图1,当点D在线段BC上时,猜想:BC与CE的位置关系,并说明理由;
(2)如图2,当点D在线段CB的延长线上时,(1)题的结论是否仍然成立?说明理由;
(3)如图3,当点D在线段BC的延长线上时,结论(1)题的结论是否仍然成立?不需要说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869516949069824/2872445400629248/STEM/e65bf804-cdb3-438a-b3f8-bc0fef15f6bb.png?resizew=576)
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【推荐1】已知:如图,直线
,点C是
之间(不在直线
上)的一个动点.
与
都是锐角,如图1,请直接写出
与
之间的数量关系;
(2)若小明把一块三角板(
)如图2放置,点D,E,F是三角板的边与平行线的交点,若
,求
的度数.
(3)将图2中的三角板进行适当转动,如图3,直角顶点C始终在两条平行线之间,点G 在线段
上,连接
,且有
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的值是否变化? 如果不变,求出比值;如果变化,请说明理由.
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(2)若小明把一块三角板(
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8685bc75adcc7238928e79296ac582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384da7acfefa7c656eaca2df173f0cb6.png)
(3)将图2中的三角板进行适当转动,如图3,直角顶点C始终在两条平行线之间,点G 在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
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【推荐2】如图,已知AC∥EH,BD∥AF,∠1=40°.
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(1)求∠DBC的度数;
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![](https://img.xkw.com/dksih/QBM/2022/2/27/2925520880967680/2927738465705984/STEM/5642c04348df4cd28e6d9dea9c1da533.png?resizew=222)
(1)求∠DBC的度数;
(2)若ED平分∠BDG,交HG于E,且∠E=10°,求∠DGH的度数.
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【推荐1】已知
,点
为直线
上的动点(点
不与点
、
重合,
交直线
于点
.
,当点
在
上时,若
,则
_______;
(2)如图
,当点
在
的延长线上时,
与
有怎样的数量关系?写出结论,并说明理由.
(3)当点
在
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与
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(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】如图,在
ABC中,∠ACB=90°,AC=BC,AD⊥CE,BE⊥CE,垂足分别为D、E
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/6bdefabc-71d8-46b6-87fc-442d430ba78b.png?resizew=159)
(1)求证:CD=BE;
(2)若DE=3,BE=2,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e9cec4ec35a714ce6f639f77d13fb4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/6bdefabc-71d8-46b6-87fc-442d430ba78b.png?resizew=159)
(1)求证:CD=BE;
(2)若DE=3,BE=2,求AD的长.
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