如图1,
中,
,点D在BC边上,点E在AD上,
,
.
(1)求证
;
(2)作
,垂足为F(如图2),探究线段CD,DE,EF的数量关系并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552bdbc4b257fab4d3e4963b47575418.png)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b67d044c290ff44f00f9f22fe7c6b61.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631199507947520/2634533174214656/STEM/a7cf868d-546a-42f3-8610-c5e295bba560.png)
20-21八年级上·辽宁大连·期末 查看更多[2]
更新时间:2021-01-12 14:34:22
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,
是
的内接三角形,
,
为
中劣弧
上一点,延长
至点
,使
.
![](https://img.xkw.com/dksih/QBM/2020/6/5/2478096685629440/2478130567815168/STEM/d79f260fe33644eba078f14f9a5962d1.png?resizew=168)
(1)求证:
;
(2)若
,试探究
与
长度的大小关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://img.xkw.com/dksih/QBM/2020/6/5/2478096685629440/2478130567815168/STEM/d79f260fe33644eba078f14f9a5962d1.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5639af5a02601a0f9388cd22dbb8c7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb026064f722ee4bfd7ffd84551306da.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,△ABC是等腰直角三角形,且∠C=90°,直线l过C点.
![](https://img.xkw.com/dksih/QBM/2017/12/9/1834714955980800/1838398587707392/STEM/f2eee56716ef4abebe1dab7878edc773.png?resizew=291)
(1)如图1,过A点、B点作直线l的垂线段AD、BE,垂足为D、E,请你探究AD、BE、DE满足的数量关系,并进行证明;
(2)当直线l绕点C旋转到如图2所示的位置时,请直接写出AD、BE和DE的数量关系(不用证明)
![](https://img.xkw.com/dksih/QBM/2017/12/9/1834714955980800/1838398587707392/STEM/f2eee56716ef4abebe1dab7878edc773.png?resizew=291)
(1)如图1,过A点、B点作直线l的垂线段AD、BE,垂足为D、E,请你探究AD、BE、DE满足的数量关系,并进行证明;
(2)当直线l绕点C旋转到如图2所示的位置时,请直接写出AD、BE和DE的数量关系(不用证明)
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解答题-证明题
|
适中
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【推荐2】【综合与实践】
问题情境:
如图1,在
中,
,
为钝角,点D是
的中点,
于点E,
于点F.试判断线段
与
的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/ee3779a8-aee6-40b6-820a-70e5b6fcad9d.png?resizew=606)
探究展示:
小宇同学展示出如下正确的解法:
解: 1 (填写
和
的数量关系),理由如下:
点D是
的中点,
是
边上中线,
,
是
的角平分线.( 2 )(填写结论依据)
,
,
.
反思交流:
(1)完成上面解题过程的两个填空:①:____________________;②____________________;
(2)利用上述结论请继续探究线段
与
的数量关系,并说明理由;
(3)如图2,在图1的条件下,点M是射线
上一点,作
,射线
交线段
于点N,求线段
、
和
之间的数量关系,并说明理由.
问题情境:
如图1,在
![](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/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/ee3779a8-aee6-40b6-820a-70e5b6fcad9d.png?resizew=606)
探究展示:
小宇同学展示出如下正确的解法:
解: 1 (填写
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e24c2bdad41127f07c6639a357d2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4046f62f73ca345f5ad182fc0c71e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e24c2bdad41127f07c6639a357d2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ced2c289548afacf525c6e59f204fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6474284422de867b608967587cc28db9.png)
反思交流:
(1)完成上面解题过程的两个填空:①:____________________;②____________________;
(2)利用上述结论请继续探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(3)如图2,在图1的条件下,点M是射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b7c9621d5fd6a1b121390c890d8138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在平面直角坐标系
中,
,
,
,
.点B与点C关于直线l对称,直线l与
的交点分别为点D,E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/4f779a16-3da8-45db-bae9-fd1d42e274ff.png?resizew=306)
(1)求点A到
的距离;
(2)连接
,补全图形并求
的面积;
(3)若位于x轴上方的点P在直线l上,
,直接写出点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93824fb894553aa5f1b1777c3f1c64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580ce5d4ad313a672ba938b78baf9773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac06bc73b408c6a70bd0f6d24ebb7d2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5dfc2edd439281ad211a3736f9484a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/4f779a16-3da8-45db-bae9-fd1d42e274ff.png?resizew=306)
(1)求点A到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(3)若位于x轴上方的点P在直线l上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9b0d3cf342e065b4c8e21443bfbfbc.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,△ABC中,AB=AC,点D、E在BC边上,AD=AE.
(1)如图1,求证:
;
(2)如图2,若点E在AC的垂直平分线上,当
时,直接写出图中所有的等腰三角形(不包括
).
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cc2450dc300ce26b513c2abae28cab.png)
(2)如图2,若点E在AC的垂直平分线上,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9666188e21ea5c4b24d5248e87dc7463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/2021/11/21/2855818583801856/2856000521920512/STEM/24b8eff7-9d65-4793-834e-9302fb141687.png?resizew=404)
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