如图,BD是△ABC的角平分线,DE∥BC,DE交AB于E,若AB=BC,则下列结论中错误的是( )
A.BD⊥AC | B.∠A=∠EDA | C.2AD=BC | D.BE=ED |
17-18八年级上·安徽·单元测试 查看更多[6]
人教版八年级数学上册 第13章 轴对称 同步单元检测试题沪科版八年级数学上册15.1轴对称全章复习与巩固河北省保定市定州市2019-2020学年八年级上学期期中数学试题(已下线)专题7.12 平行线的证明(全章复习与巩固)(培优篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(北师大版)内蒙古巴彦淖尔市乌拉特前旗第三中学2022-2023学年八年级下学期教学学情检测数学试题陕西省咸阳市泾阳县2023-2024学年八年级下学期试题数学试题
更新时间:2017-10-27 09:34:04
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【推荐1】如图所示,锐角△ABC中,D,E分别是AB,AC边上的点,△ADC≌
,△AEB≌
,且
,BE、CD交于点F,若∠BAC=40°,则∠BFC的大小是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea22475e13741a475c3ed7a3ff1c7793.png)
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A.105° | B.100° | C.110° | D.115° |
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【推荐2】如图所示,菱形ABCD的顶点A在反比例函数y=
(x>0)的图象上,函数y=
(k>5,x>0)的图象关于直线AC对称,且经过点B、D两点.若AB=2,∠DAB=30°,如下结论:①O、A、C三点在同一直线上;②点A的横坐标是
;③点D的坐标是(
+1,2
);④比例系数k的值为10+
.其中不正确的结论是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/df9819dd-7597-4cda-9813-1f2a3e33c7a2.png?resizew=209)
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A.①②③ | B.②③④ | C.①③④ | D.①②④ |
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【推荐1】如图,在
中,
和
的平分线相交于点O,过点O作
交BC于F,交AC于E,过点O作
于D,下列四个结论:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4c3415df69a347d4a9c9e79995f676.png)
;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11b9c23e783011badd56c0da71ae8225.png)
;
当
时,E,F分别是
,
的中点;④若
,
,则
.其中正确的是( )
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【推荐2】如图,在△ABC中,∠B、∠C的平分线交于点F,过点F作DE∥BC交AB于点D,交AC于点E,下列结论:①△BDF,△ADE都是等腰三角形;②DE=BD+CE;③△ADE的周长等于AB+AC;④BF=CF;⑤若∠A=80°,则∠BFC=130°,其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2022/6/1/2991992158773248/2992112936017920/STEM/c67c453b-1f9f-400d-a1f3-7cb80bfa2cf0.png?resizew=156)
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A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐1】将四个全等的直角三角形作为叶片按图1摆放成一个风车形状,形成正方形
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,
,
.若
平分
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【推荐2】如图,在
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作
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于
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作
于
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;④设
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