如图,在矩形ABCD中,O为AC中点,过点O的直线分别与AB,CD交于点E、F,连接BF交AC于点M,连接DE,BO.若
,
.则下列结论:①FB垂直平分OC;②四边形DEBF为菱形;③
;④
;⑤
.其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/1/29/2646505746874368/2652172381364224/STEM/14cf0a1f-7a73-4ee2-98b9-078afe59ff40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c0ec189655594ca472774c3ae420f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb6abd4e67785049f8ea82d2309f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/badb556bbc8099b924afe88b36f66767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9619c5d5ac876196302e4c08f99ecbd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74f9ea758d4a8f68c6ecef65d237ed1.png)
![](https://img.xkw.com/dksih/QBM/2021/1/29/2646505746874368/2652172381364224/STEM/14cf0a1f-7a73-4ee2-98b9-078afe59ff40.png)
A.5个 | B.4个 | C.3个 | D.2个 |
更新时间:2021-02-06 12:41:26
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【推荐1】如图,
是
的直径,
分别是
的中点,
在
上.下列结论:①
;②
;③四边形
是正方形;④
.其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2020/9/3/2541907815718912/2542385099079680/STEM/94315c5e-af03-407f-8bf9-eaf325a1fc02.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,平面直角坐标系中,直线
与x轴交于A点,与y轴交于B点,
是这条直线上一点,且
是方程
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【推荐1】如图,
中,
为钝角,以
为边向外作平行四边形
,
为钝角,连结
,
,设
,
,
的面积分别为
,
,
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【推荐2】如图,在
中,
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,正方形
与正方形
.延长
,
分别交
,
于点
,
,连结
,
.图中两块阴影部分面积分别记为
,
,若
,四边形
,则四边形
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.5 | B.6 | C.8 | D.9 |
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【推荐1】嘉嘉将一个平行四边形纸片
沿
折叠,使点
与点A重合,点
落到点
处,打开后如图所示.嘉嘉又告诉同组的甲、乙、丙三位同学,
,
,
.他们分别给出了如下结论:甲:
;乙:四边形
的周长为
;丙:
.你认为说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/7/20/3026518234570752/3054004402069504/STEM/026a3079e0064425b4284132b7a93984.png?resizew=171)
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A.只有甲、乙正确 | B.只有乙、丙正确 |
C.只有甲、丙正确 | D.甲、乙、丙都正确 |
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【推荐2】如图1,在△ABC中,AB=AC,∠BAC=120°,点E是边AB的中点,点P是边BC上一动点,设PC=x,PA+PE=y.图2是y关于x的函数图象,其中H是图象上的最低点.那么a的值为( )
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