1 . 如图,
和
都是等腰直角三角形,
,连结BD.CE交于点G.请你判断线段BD与线段CE的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://img.xkw.com/dksih/QBM/2021/1/2/2627320574066688/2635267560374272/STEM/330e91a5-89df-4fcb-837d-11f27c5c9e4a.png)
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2 . 如图1,在
中,
,点D是直线BC上一点(不与点BC重合),以AD为一边在AD的右侧作
,使
,
,连接CE.设
,
.
(1)求证:
.
(2)当点D在线段BC上运动时,
①
,则
________
.
②猜想
与
之间的数量关系,并对你的结论进行证明
(3)如图2,当点D在线段BC的反向延长线上运动时,猜想
与
之间的数量关系,并对你的结论给出证明.
![](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/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43651721f6c0ea4cf50a33054ecc5d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80bb35aee114b8467fdc10a2cab02ad.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ee10d27038214b1c255de8a0e348c6.png)
(2)当点D在线段BC上运动时,
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51af2577e349157f70effa2a074c9c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)如图2,当点D在线段BC的反向延长线上运动时,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631170971557888/2634564647084032/STEM/b4070502-9b03-4bcc-a9fb-0008e0b49b76.png)
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2021-01-12更新
|
363次组卷
|
3卷引用:广东省汕头市潮阳区铜盂镇2020-2021学年八年级上学期期末数学试题
3 . 如图,
与
都是等边三角形,
.下列结论中,①
;②
;③
.其中正确的有( ).
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631170971557888/2634564646731776/STEM/5006bfc0-91fb-439c-907e-c67a0e684964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6eab933fd3ed8a3a412a6f268d4cef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00e0ca93b81029af5c4cd3bbd0314ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28a1826356fe910c2418e0f38f1522fd.png)
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631170971557888/2634564646731776/STEM/5006bfc0-91fb-439c-907e-c67a0e684964.png)
A.0个 | B.1个 | C.2个 | D.3个 |
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4 . 如图,
,
,
,
,证明
的理由是( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/dd9ba5e9-ed24-4bd2-b12b-bb55f810e7f8.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929cb983368ee2128dd7a894e61ff73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e2132b711f5aa21a0048ad3fc37f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efec694f0e0b9049acd183369ab56edb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4a2a127d89d50d3fde881a9b58ef0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0934b4d36ff1b481998861486f0734.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/dd9ba5e9-ed24-4bd2-b12b-bb55f810e7f8.png?resizew=179)
A.HL | B.SAS | C.ASA | D.AAS |
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5 . 下列说法正确的( )个.
①0.09的算术平方根是0.03;②1的立方根是±1;③3.1<
<3.2;④两边及一角分别相等的两个三角形全等.
①0.09的算术平方根是0.03;②1的立方根是±1;③3.1<
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
A.0 | B.1 | C.2 | D.3 |
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6 . 如图:△ABC和△CDE是等边三角形.求证:BE=AD.
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631097694674944/2633045906628608/STEM/57a6beb7-0f44-4b15-b5e7-dd88966ce93c.png)
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2021-01-10更新
|
129次组卷
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2卷引用:广西南丹县八圩瑶族乡初级中学2020-2021学年八年级上学期第二次月考数学试题
7 . 如图(1),已知
,D为
的角平分线上一点,连接BD,CD;如图(2),已知
,D,E为
的角平分线上两点,连接BD,CD,BE,CE;如图(3),已知
,D,E,F为
的角平分线上三点,连接BD,CD,BE,CE,BF,CF;……,依此规律,第7个图形中有全等三角形的对数是________ .
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/2020/11/14/2599070356766720/2630989025656832/STEM/b1d5583ea97a4f05be333d3a02b7f389.png?resizew=476)
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2021-01-07更新
|
171次组卷
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2卷引用:黑龙江省牡丹江市2020-2021学年八年级上学期期中考试数学试题
8 . 在△ABC和△DEF中,下列给出的条件,能用“SAS”判定这两个三角形全等的是( )
A.AB=DE,BC=DF,∠A=∠D | B.AB=BC,DE=EF,∠B=∠E |
C.AB=EF,AC=DF,∠A=∠D | D.BC=EF,AC=DF,∠C=∠F |
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2021-01-06更新
|
281次组卷
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3卷引用:四川省眉山市东坡区百坡初级中学2020-2021学年八年级上学期第三次月考数学试题
9 . 如图,在△ABC中AB=AC,BD=CE,BE=CF,若∠A=40°,则∠DEF=______ 度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/86561fa8-7564-4034-89b5-4605446302b9.png?resizew=166)
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10 . 如图所示,有一块三角形的镜子,小明不小心弄破裂成1、2两块,现需配成同样大小的一块.为了方便起见,只带上第1块,依据是________ 方法判定全等
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/cb5e633e-7f4b-47ec-aa69-19e6e1f420d7.png?resizew=117)
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