如图,已知△ABC中,∠B=α,∠C=β,(α>β)AD是BC边上的高,AE是∠BAC的平分线,则∠DAE的度数为( )
![](https://img.xkw.com/dksih/QBM/2020/1/19/2380213803171840/2380637098729472/STEM/8410090e2a7649729c30caff0cc07b10.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/2020/1/19/2380213803171840/2380637098729472/STEM/8410090e2a7649729c30caff0cc07b10.png?resizew=163)
A.α﹣β | B.2(α﹣β) | C.α﹣2β | D.![]() |
更新时间:2020-01-19 21:21:29
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【知识点】 与三角形的高有关的计算问题解读
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【推荐1】在平面直角坐标系
中,点
,
是
轴上的两点,且
,有一点
与
构成三角形,若三角形
的面积为3,则点
的纵坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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![](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/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
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A.3 | B.2或![]() | C.2 | D.3或![]() |
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【推荐2】如图,将
折叠,使点
落在
边
处,展开后得到折痕
,则
是
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.高线 | B.角平分线 | C.中线 | D.中位线 |
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