如图,Rt△ABC中,∠C=90°,以点B为圆心,适当长为半径画弧,与∠ABC的两边相交于点E,F,分别以点E和点F为圆心,大于
EF的长为半径画弧,两弧相交于点M,作射线BM,交AC于点D.若△BDC的面积为10,∠ABC=2∠A,则△ABC的面积为( )
![](https://img.xkw.com/dksih/QBM/2016/1/7/1573950010540032/1573950016331776/STEM/c4f801d945244477845e9eb5ef412b77.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2016/1/7/1573950010540032/1573950016331776/STEM/c4f801d945244477845e9eb5ef412b77.png?resizew=180)
A.25 | B.30 | C.35 | D.40 |
更新时间:2016-01-07 11:21:13
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名校
【推荐1】如图,点B为反比例函数
(
)上的一点,点
为x轴负半轴上一点,连接
,将线段
绕点A逆时针旋转90°;点B的对应点为点C.若点C恰好也在反比例函数
的图象上,且C点的横坐标是A点横坐标的两倍,则k=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/8544d829-11c2-4193-9159-f618f70648c3.png?resizew=187)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebbdd3ef87c96566fb15a88a9126a76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39429977ca55c8e00a431656cfc40b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/8544d829-11c2-4193-9159-f618f70648c3.png?resizew=187)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在矩形
中,点
是
的中点,
的平分线交
于点
,将
沿
折叠,点
恰好落在
上
点处,延长
,
交于点
.有下列四个结论:①
垂直平分
;②
平分
;③
;④
.其中,将正确结论的序号全部选对的是( )
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074891329339392/2136479240732672/STEM/3cf8a8b7aa7f483a809df0bcab785e52.png?resizew=88)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a34a1a0354e836d4c88eeb7d2589283.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3686a991fb2ba017a6890bc6208e8a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e9557ef9c9c33fe9691c9c51600c9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3abf3173133683369785897e67fa84.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c72171ccd9796fbb7b493a2d927a39.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa398dbfb7544746c8bfdaddd6a066c9.png)
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A.①②③ | B.①②④ | C.②③④ | D.①②③④ |
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【推荐1】如图,在锐角△ABC中,∠BAC=45°,AB=2,∠BAC的平分线交BC于点D,M、N分别是AD和AB上的动点,则BM+MN的最小值是( ).
![](https://img.xkw.com/dksih/QBM/2022/3/15/2936757482954752/3062651524972544/STEM/107eb6d2cd3d4b39a5485d7d11bfa0ca.png?resizew=160)
![](https://img.xkw.com/dksih/QBM/2022/3/15/2936757482954752/3062651524972544/STEM/107eb6d2cd3d4b39a5485d7d11bfa0ca.png?resizew=160)
A.![]() | B.2 | C.![]() | D.![]() |
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【推荐2】如图,
是
的角平分线,
,垂足为
,
,
和
的面积分别为48和26,则
的面积为( )
![](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/7aa30a9ee227af2b387cf6e028c20d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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A.11 | B.22 | C.26 | D.37 |
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【推荐1】如图,在
中,按照如下尺规作图的步骤进行操作:
交于M,N两点;
②分别以M,N为圆心,以适当长为半径画弧,两弧交于点D,作射线
与
交于点E;
③分别以B,C为圆心,以大于
的长为半径画弧,两弧交于点P,Q,作线段
与
于点F;
④连接
.
若
,
,则
的周长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
②分别以M,N为圆心,以适当长为半径画弧,两弧交于点D,作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761dd5f55ed3434fe1dfa6339a55e832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
③分别以B,C为圆心,以大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d452f74791f58e8400cb8d2d6038dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3c3fd476a7ba1a5f746084513840f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f2e02f64e9ffe7b0ea50805fa5e08cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在
ABC中,BA=BC,∠B=80°,观察图中尺规作图的痕迹,∠DCE的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/7aae607c-7ee7-488a-bd5b-1ab7500685eb.png?resizew=137)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/7aae607c-7ee7-488a-bd5b-1ab7500685eb.png?resizew=137)
A.45° | B.50° | C.55° | D.65° |
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