下列命题: ①两条直线被第三条直线所截,同位角相等;②两点之间,线段最短;③相等的角是对顶角;④同角或等角的补角相等.其中正确的命题有( )
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2019-07-01 10:19:19
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【推荐1】如图,已知在△ABC中,∠ACB=30°,CP为∠ACB的平分线,CP=6,点M,N分别是边AC和BC的动点,则△PMN周长的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/0ab7dd1d-26f0-4d01-ba55-9e143d01f562.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/0ab7dd1d-26f0-4d01-ba55-9e143d01f562.png?resizew=200)
A.4 | B.6 | C.![]() | D.10 |
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【推荐2】已知直线
:
与直线
:
都经过
,直线
交
轴于点
,交
轴于点
,直线
交
轴于点
,
为
轴上任意一点,连接
、
,有以下说法:①方程组
的解为
②
;③当
的值最小时,点
的坐标为
.其中正确的说法是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/57201bd4-335f-48d1-89a6-72a22555db59.png?resizew=143)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe22d0cee40ad652466d25d9e7c9264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40020be713d83506f38178a45056eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557437a8641a61bf64c1e40f2bbf72a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9450c6ac774bad6887fd6ccdeab86e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5084fa7e7330e7156bd4e231292f373f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75eafafb6345e342e9c3f3cbd3abf8b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fec211e99fadcc7ce7603af11f1e0df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc5089f93a128b9eaf15e7d895ab0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/57201bd4-335f-48d1-89a6-72a22555db59.png?resizew=143)
A.①② | B.①③ | C.②③ | D.①②③ |
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【推荐1】已知
,
互补,那么
与
之间的关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc8dfa26ec4d64fa6c91d7d9eaf6d29.png)
A.和为45° | B.差为45° | C.互余 | D.差为90° |
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【推荐2】如图,在△ABC中,∠ACB=90°,AC=8,BC=7,以斜边AB为边向外作正方形ABDE,连接CE,则CE的长为( )
A.14 | B.15 | C.16 | D.17 |
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【推荐1】下列说法中正确的是( )
A.相等的角是对顶角 | B.同位角相等 |
C.过一点有且只有一条直线与已知直线平行 | D.直线外一点与直线上各点连接的所有线段中,垂线段最短 |
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【推荐2】如图所示,直线AB,CD,EF,GH,MN相交于点O,则图中对顶角共有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/6/93262139-fba5-47a3-a7b7-cef1131b07d0.jpg?resizew=166)
A.3对 | B.6对 | C.12对 | D.20对 |
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【推荐1】如图,在
中,点
为
的中点,
的边
过点
,且
,
,
平分
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/8db9a219-99ce-4a70-ad9e-102f7e29c9ea.png?resizew=195)
A.10 | B.8 | C.7 | D.6 |
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【推荐2】如图所示,有一块含有30°角的直角三角板的一个顶点放在直尺的一条边上.如果∠2=52°,那么∠1的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/78fae561-5b9a-4101-a4b2-fbdec6c94274.png?resizew=187)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/78fae561-5b9a-4101-a4b2-fbdec6c94274.png?resizew=187)
A.44° | B.25° | C.36° | D.38° |
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