在
中,
°,
,点
在线段
上,以
为边作正方形
,
与
的交点分别为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
(1)求证:
;
(2)若点
为
的中点,求
的长;
(3)当
为等腰三角形时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c041684b2d1b90aaca06997e471a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27763f6dcbae61e12858d1893034164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f23da5bc0c9e2acd1f120e00be7298c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029ad83f1a3262048cba0e650b63e929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437924024696832/2438629650407424/STEM/3ff2166ba7d2409699b07345ae66b96f.png?resizew=232)
更新时间:2020-04-10 19:47:38
|
相似题推荐
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【推荐1】如图,在△ABC中,∠BAC=45°,
,垂足为D,DC=DE,过点E作EF//BC,交AB于点F.
(1)求证:∠EDA=2∠B;
(2)探究线段AD,EF和CD的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(1)求证:∠EDA=2∠B;
(2)探究线段AD,EF和CD的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/2020/11/9/2589145076359168/2609076490297344/STEM/4817d90f-0735-4fe2-af2f-674b2cceb5a5.png)
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【推荐2】CD是经过∠BCA的顶点C的一条直线,CA=CB,E、F分别是直线CD上两点,且∠BEC=∠CFA=∠α,若直线CD经过∠BCA的内部,且E、F在射线C、D上,请解答下面的两个问题:
(1)如图1,若∠BCA=90°,∠α=90°,则BE CF,EF |BE﹣AF|(填“>”、“<”、“=”);
(2)如图2,若0°<∠BCA<180°,请添加一个关于∠α与∠BCA关系的条件 ,使(1)中的两个结论仍然成立,并证明两个结论成立.
(1)如图1,若∠BCA=90°,∠α=90°,则BE CF,EF |BE﹣AF|(填“>”、“<”、“=”);
(2)如图2,若0°<∠BCA<180°,请添加一个关于∠α与∠BCA关系的条件 ,使(1)中的两个结论仍然成立,并证明两个结论成立.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2584720483418112/2588070657818624/STEM/c7aac2c934c64846a347cda968a1d37d.png?resizew=260)
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【推荐1】已知
为
的直径,
,C为
上一点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/3806cc28-6f0b-446d-820f-230944de2543.png?resizew=284)
(1)如图①,若C为
的中点,求
的大小和
的长;
(2)如图②,若
为
的半径,且
,垂足为E,过点D作
的切线,与
的延长线相交于点F,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1f94af7f35686f4a8a268392abc9ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/3806cc28-6f0b-446d-820f-230944de2543.png?resizew=284)
(1)如图①,若C为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae86c9214aa348b73b2e527efac962a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c06c935db45144d8917a2d4944ca4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
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【推荐2】如图1,A,B,C是郑州市二七区三个垃圾存放点,点B,C分别位于点A的正北和正东方向,
米.6位环卫工人分别测得的
长度如下表:
他们又调查了各点的垃圾量,并绘制了下列不完整的统计图2.
(1)表中的中位数是__________,众数是_____________,
长度的平均数
_____________.
(2)求A处的垃圾量,并将图2补充完整;
(3)用(1)中的
作为
的长度,要将A处的垃圾沿道路
都运到C处,已知运送1千克垃圾每米的费用为0.05元,求运垃圾所需的费用.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a3debb802dd4f3e774b16ad1c154ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
甲 | 乙 | 丙 | 丁 | 戊 | 己 | |
| 104 | 98 | 102 | 96 | 100 | 100 |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/f5348b73-6d5d-40c6-a7f4-1ae785047bd4.png?resizew=599)
(1)表中的中位数是__________,众数是_____________,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dbf960f730c5e53917e3daba8067770.png)
(2)求A处的垃圾量,并将图2补充完整;
(3)用(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐1】如图,点A、B分别在y轴和x轴上,BC⊥AB(点C和点O在直线AB的两侧),点C的坐标为(4,n)过点C的反比例函数y=
(x>0)的图象交边AC于点D(n+
,3).
![](https://img.xkw.com/dksih/QBM/2020/6/27/2493741397803008/2494609491550208/STEM/8b958649de284e72a981818e9082367b.png?resizew=161)
(1)求反比例函数的表达式;
(2)求点B的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7626c207a4dc82d4d59cb520c91e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2020/6/27/2493741397803008/2494609491550208/STEM/8b958649de284e72a981818e9082367b.png?resizew=161)
(1)求反比例函数的表达式;
(2)求点B的坐标.
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【推荐2】综合与实践
莹莹复习教材时,提前准备了一个等腰三角形纸片
,如图,
,
.为了找到重心,以便像教材上那样稳稳用笔尖顶起,她先把点B与点C重叠对折,得折痕
,展开后,她把点B与点A重叠对折,得折痕
,再展开后连接
,交折痕
于点O,则点O就是
的重心.
(1)初步观察:连接
,则
与
的数量关系是:________;
(2)初步探究:请帮助莹莹求出
的面积;
(3)猜想验证:莹莹通过测量惊奇地发现
,
.她的发现正确吗?请说明理由.
莹莹复习教材时,提前准备了一个等腰三角形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
如图,用铅笔可以支起一张均匀的三角形卡片.你知道怎样确定这个点的位置吗?![]() ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)初步探究:请帮助莹莹求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
(3)猜想验证:莹莹通过测量惊奇地发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321231b7c9c2902f953d47f0137bb823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11995c96da35c9a923c86385e5a572ee.png)
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【推荐1】如图,一艘轮船在
处观测到北偏东53°方向上有灯塔
,轮船以
的速度匀速向正东方向航行
到达
处,又观测到灯塔
在北偏东22°方向上,已知灯塔
周围
的范围内有暗礁,若轮船沿此航线继续航行是否有触礁危险?请说明理由.(参考数据:
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1804ca8e6ef5c27cfc2e7022df3380a2.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/85ebb3b2655fd56ff5cee225ec1a7cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1e9a033db3189f41c51a9173221be9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0017113f394bc42d821adeb220857cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be75524e01ff409c494f4a5d06ba4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134b920d0b80633788ae8fae2029d60c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1804ca8e6ef5c27cfc2e7022df3380a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a07ac0b53080a8102beafba7f1a76282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888e6e9e6ca20554cc98547b1a3f8bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04390bfdcc0c4707fd43a2c0b6a585f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab9ef8b634c2a582a9b1fb20fdd3a0c.png)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728033455710208/2730755915677696/STEM/5cb5e1ff-fd71-4126-8756-cb17b8fa6ac7.png)
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名校
【推荐2】如图,⊙O是△ABC的外接圆,AB为直径, OD∥BC交⊙O于点D,交AC于点E,连接AD,BD,CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/92a0832c-5f03-4286-baca-b6f8af616df0.png?resizew=180)
(1)求证:AD=CD;
(2)若AB=10,cos∠ABC=
,求tan∠DBC的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/92a0832c-5f03-4286-baca-b6f8af616df0.png?resizew=180)
(1)求证:AD=CD;
(2)若AB=10,cos∠ABC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
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