如图,
中,
,点
在
边上,延长
到点
且
,延长
,
交于点
,
.
相等的角是______;
(2)求
的度数;
(3)若
,
,求
的长.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7712b57a32fc19b358361c43e7195b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e37b078d02601f76f0f8320b410809f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fe7f306533f388843ff62fa2b5251a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980d518d74f602d99c6a4887919b3eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8946331b0a9d86e1a9c78797f3021455.png)
更新时间:2023-05-03 21:37:13
|
相似题推荐
解答题-计算题
|
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【推荐1】综合与实践:八年级数学兴趣小组开展了测量体育馆高度
的实践活动,测量方案如下表:
请你根据兴趣小组测量方案及数据,计算体育馆高度
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
课题 | 测量体育馆高度![]() |
测量工具 | 测角仪、皮尺等 |
测量方案示意图 | ![]() |
测量步骤 | ①在体育馆外,选定一点![]() ②测量体育馆顶点 ![]() ![]() ![]() ③测量 ![]() ④放置一根与 ![]() ![]() ![]() ⑤测量标杆顶部 ![]() ![]() |
测量数据 | ![]() ![]() ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-作图题
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【推荐2】如图,在△ABC中,∠ABC=42º,∠C=78º,AD平分∠BAC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/b300aae2-f4d5-4b4f-ada6-2b65f0956795.png?resizew=194)
(1)求∠ADC的度数;
(2)在△ABD中分别画出BD边和AD边上的高AE、BF,试说明∠DAE=∠DBF,并求∠DAE的度数;
(3)试探究∠DAE与∠ABC,∠C之间的数量关系,写出你的结论.(不必写理由)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/b300aae2-f4d5-4b4f-ada6-2b65f0956795.png?resizew=194)
(1)求∠ADC的度数;
(2)在△ABD中分别画出BD边和AD边上的高AE、BF,试说明∠DAE=∠DBF,并求∠DAE的度数;
(3)试探究∠DAE与∠ABC,∠C之间的数量关系,写出你的结论.(不必写理由)
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解答题-证明题
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【推荐1】如图,在
中,
,
,
是
边上的中点,将
绕点
顺时针旋转,旋转角为
得到
,
的两边分别与
、
边相交于点
,
两点,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/e962839a-3f18-4daf-8baf-d3426f5e0d5e.png?resizew=423)
(1)求证:
;
(2)在此旋转变化的过程中,
的大小是否发生变化?若不变,请求出
的度数;若变化,请说明如何变化.
(3)当
为等腰三角形时,求
的长度(温馨提示:在
中
)
![](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/f07237813646377deb87865945ed5185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666b354593899013cac74ce74aaf0102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/849ef707fada02c6b030c8681736804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/849ef707fada02c6b030c8681736804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/e962839a-3f18-4daf-8baf-d3426f5e0d5e.png?resizew=423)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07ed8464d3377a1e6d89875b6677731a.png)
(2)在此旋转变化的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4371a4e0c848f28f263b10c1ee6b61a.png)
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【推荐2】如图,点E是
内一点,且
.
相等的角,并证明;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
(3)用等式表示线段
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73b5895dd2421d90d49c3b2c9ba760c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
(3)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ef4ac2df9a885d977091995732faf4.png)
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名校
【推荐1】如图,
是线段
上一点,分别以
和
为边长,在直线
的同一侧作两个等边三角形,
和
,连接
和
,
与
交于点
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/c6a05630-9873-4d0a-8c14-ff413a2548f0.png?resizew=220)
(1)求证:
;
(2)探究
的形状,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b265d121f9ebc13671a5719604476a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/c6a05630-9873-4d0a-8c14-ff413a2548f0.png?resizew=220)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4db192a176978a1240d931677724694.png)
(2)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e977cb08909ddb77a8c1236bca620ac5.png)
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解答题-作图题
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名校
【推荐2】如图,P是等边三角形ABC内的一点,且PA=6,PB=8,PC=10.
(1)尺规作图:作出将△PAC绕点A逆时针旋转60°后所得到的△P′AB(不要求写作法,但需保留作图痕迹).
(2)求点P与点P′之间的距离及∠APB的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/ee4db391-f715-403c-bc2f-6adb0339ced9.png?resizew=103)
(1)尺规作图:作出将△PAC绕点A逆时针旋转60°后所得到的△P′AB(不要求写作法,但需保留作图痕迹).
(2)求点P与点P′之间的距离及∠APB的度数.
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解答题-证明题
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名校
【推荐1】如图,
为
的直径,点C在
上,
,直线
于点D,交AB的延长线于点F.
为
的切线;
(2)当
,
时,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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086c3f6c2e1d75b48c004b7f4954557e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf79cfe0fdfb20eeac5c6f38e2dab8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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解答题-问答题
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【推荐2】如图,在梯形ABCD中,
,∠BAD=90°,AD+AB=14,(AB>AD),BD=10,BD=DC,E、F分别是BC、CD上的点,且CE+CF=4.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987925716205568/2989977065512960/STEM/1aec4d9b7a5b4a0f90506739a30181ca.png?resizew=128)
(1)求BC的长;
(2)设EC的长为x,四边形AEFD的面积为y,求y关于x的函数关系式,并写出函数的定义域;
(3)在(2)的条件下,如果四边形AEFD的面积等于40,试求EC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987925716205568/2989977065512960/STEM/1aec4d9b7a5b4a0f90506739a30181ca.png?resizew=128)
(1)求BC的长;
(2)设EC的长为x,四边形AEFD的面积为y,求y关于x的函数关系式,并写出函数的定义域;
(3)在(2)的条件下,如果四边形AEFD的面积等于40,试求EC的长.
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解答题-证明题
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【推荐3】【问题初探】
数学课上,老师提出如下问题:
如图①,
是
的中线,M是
的中点,
的延长线交
于N,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b50f83fd73b99fc0e0c61d80346e3c7.png)
甲同学的思路:如图②,过点D作
,交B
于点K,利用全等将
与
的数量关系转化为
与
之间的关系;
乙同学的思路:如图③,过点A作
的平行线交
的延长线于点K,利用相似将
与
的数量关系转化为
与
之间的关系.
(1)请你选择一名同学的思路,写出证明过程;
(2)【类比分析】
老师发现两名同学都利用了转化思想.为了帮助同学更好地利用转化思想解决问题提出:如图④,在
中,
是
边上的中线,N,K是
的三等分点,
交
于M,
交
于P,求
的值.请你写出解答过程;
(3)【学以致用】
在
中,
.在直线
上取点B,使
,连接
,在线段
上取点A,连接
,直线
交直线
于F,当
时,求
的值.请根据题意画出图形并简要的写出解答过程.
数学课上,老师提出如下问题:
如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b50f83fd73b99fc0e0c61d80346e3c7.png)
甲同学的思路:如图②,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0abc7da541eb5b47420882e9e84f883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebffbdca89cc68c33706ab069fc6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
乙同学的思路:如图③,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)请你选择一名同学的思路,写出证明过程;
(2)【类比分析】
老师发现两名同学都利用了转化思想.为了帮助同学更好地利用转化思想解决问题提出:如图④,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad8115387158c8dda205d26968ba11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5040c551fb69594423057ce867f725.png)
(3)【学以致用】
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510634e49198fc429d942d00fa5446ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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