题型:解答题-问答题
难度:0.65
引用次数:238
题号:16893132
如图,E点为DF上的点,B为AC上的点,∠1=∠2,∠C=∠D,那么
,请完成它成立的理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/f25a84c7-1aed-4aa3-921d-d37e65ded97d.png?resizew=158)
∵∠1=∠2
且∠2=∠3,∠1=∠4(____________)
∴∠3=∠4(____________)
∴______
______(____________)
∴∠C=∠ABD(____________)
∵∠C=∠D(____________)
∴∠D=∠ABD
∴
(____________).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a04b6b10b8b2788f026b95ce367d63.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/f25a84c7-1aed-4aa3-921d-d37e65ded97d.png?resizew=158)
∵∠1=∠2
且∠2=∠3,∠1=∠4(____________)
∴∠3=∠4(____________)
∴______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
∴∠C=∠ABD(____________)
∵∠C=∠D(____________)
∴∠D=∠ABD
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a04b6b10b8b2788f026b95ce367d63.png)
更新时间:2022-10-02 08:48:40
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【知识点】 根据平行线判定与性质证明
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适中
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名校
【推荐1】已知两条直线
,
被直线
所截,分别交于点
、点
,
平分
交
于点
,且
.
为直线
上一点,判断
、
的位置关系,并说明理由;
(2)如图2,点
为直线
上一点,作
的平分线交
于
,过点
作
于点
.
①当
时,
______
,
______
(直接写出答案);
②当点
在直线
上运动时,设
,
,
和
之间有怎样的数量关系?请写出你的猜想,并加以证明.
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(2)如图2,点
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①当
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②当点
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在平面直角坐标系
中,已知点
,点
,将线段
平移至
,点
在
轴的正半轴上移动(不与点
,
重合),连接
,
,
,
,且
.
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(1)直接写出点
的坐标;
(2)点
在运动过程中,是否存在点
,满足
,如果存在,请求出点
的坐标;如果不存在,请说明理由;
(3)点
在运动过程中,请直接写出
,
,
三者之间存在的数量关系.
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