下列命题中正确的是( )
A.形如“![]() |
B.到三角形的三个顶点距离相等的点是三角形三条角平分线的交点 |
C.两个数的和与这两个数的差的积等于这两个数的平方差 |
D.等腰三角形的高、中线、角平分线互相重合 |
更新时间:2023-03-17 21:50:14
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【推荐2】下列关于x的方程中,一定有实数根的是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在
中,
,
,AB的垂直平分线EF交AC于点D,
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/d280af31-22e9-4fa8-b00f-ee9de3195ae7.png?resizew=198)
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A.15° | B.20° | C.25° | D.10° |
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【推荐2】如图,已知
中,
,
,
的垂直平分线MN交
于D,
于M.以下结论:①
;②
是
的角平分线;③
的周长
;④
.正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/eea4e6ac-f2b8-42d5-acb0-34b2297e231b.png?resizew=132)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.①② | B.①③ | C.②③ | D.③④ |
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【推荐1】如图,已知
,点
在边
上,
,点
、
在边
上,
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等于( ).
![](https://img.xkw.com/dksih/QBM/2019/11/5/2327357817593856/2327577519661056/STEM/589d0f67c7814f0a8aed9716b643701f.png?resizew=124)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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A.![]() | B.![]() | C.5 | D.4 |
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【推荐2】如图,△ABC中,AB=AC,BC=6,AC的垂直平分线EF分别交AC,AB边于E,F点,若点D为BC的中点,点M为线段EF上一动点,当△CDM周长取得最小值为13时,△ABC的面积为( )
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