如图,在
中,AB=AC,AD是BC边上的中线,AC 的垂直平分线分别交AC、AD、AB于点E、O、F,连接OB,OC.
(1)求证:点O在AB的垂直平分线上;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求证:点O在AB的垂直平分线上;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85d54c7984435f2f306baac99f5dd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843adec8fba1741ccb81a9017cfb815f.png)
![](https://img.xkw.com/dksih/QBM/2021/4/25/2707301463212032/2710371217571840/STEM/507c6b08938f449a980d3b5a7b2af428.png?resizew=161)
更新时间:2021-04-29 18:07:16
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解答题-问答题
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适中
(0.65)
【推荐1】如图在平面直角坐标系中,O为原点,A、B两点分别在y轴、x轴的正半轴上,
的一条内角平分线、一条外角平分线交于点P,P在反比例函数
的图象上.
(2)若
,求
的度数;
(3)如果直线
的关系式为
,且
,作反比例函数
,过点
作x轴的平行线与
的图象交于点M,与
的图象交于点N,过点N作y轴的平行线与
的图象交于点Q,是否存在k的值,使得
的和始终是一个定值d,若存在,求出k的值及定值d;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(3)如果直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279e97dbb942fb06db0b6acc0c3b6744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0981592ba885b13c8a92b08eaeb334ae.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975db8ff59ce1b374a8f187bb8ecc0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279e97dbb942fb06db0b6acc0c3b6744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8cb8e781cada9b68455d5fe4c0522df.png)
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【推荐2】学完“等边三角形”一节后,老师布置了一道思考题:如图,点M、N分别在正
的边
,
上,且
,
,
所在直线相交于点Q.求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/a4a95847-1395-4f7c-b385-fd4aacfd7198.jpg?resizew=240)
(1)请完成这道思考题的证明;
(2)做完(1)后,爱动脑筋的同学提出了如下问题:若将题中的点M,N分别移动到
,
的延长线上,是否仍能得到
?请作出判断,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdc9f4a99b567a6ee4be3943beeddca.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/a4a95847-1395-4f7c-b385-fd4aacfd7198.jpg?resizew=240)
(1)请完成这道思考题的证明;
(2)做完(1)后,爱动脑筋的同学提出了如下问题:若将题中的点M,N分别移动到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcb4b61e2b5f2eada9b457b5d4fb412.png)
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【推荐1】如图,在
中,
,点D,E分别是边
上的点,且
.
![](https://img.xkw.com/dksih/QBM/2021/10/14/2829088276160512/2829264516104192/STEM/3285d215-54cd-41b8-a99f-fb74e47177d9.png)
(1)求证:
;
(2)若
,当
时,求
和
.
![](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/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b8ee3c2174306999d94daf1fcea4a7.png)
![](https://img.xkw.com/dksih/QBM/2021/10/14/2829088276160512/2829264516104192/STEM/3285d215-54cd-41b8-a99f-fb74e47177d9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbfb7665a54463b68487b6c53cdd97b3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d1ec7a92593d9718c43c633a2c2c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
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【推荐2】如图,在△ABC中,点D是AB的中点,点F是BC延长线上一点,连接DF,交AC于点E,连接BE,∠A=∠ABE
(1)求证:ED平分∠AEB;
(2)若AB=AC,∠A=38°,求∠F的度数.
(1)求证:ED平分∠AEB;
(2)若AB=AC,∠A=38°,求∠F的度数.
![](https://img.xkw.com/dksih/QBM/2020/3/22/2424822356459520/2425135401369600/STEM/05f5dbd71a37448ea64d048d1461dfc5.png?resizew=209)
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