在Rt△ABC中,∠BAC=90°,AD是△ABC的中线,∠ADC=45°,把△ADC沿AD对折,使点C落在C′的位置,C′D交AB于点Q,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a47142bcdaa42d15a224c680ad972d5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2020·广西贵港·模拟预测 查看更多[2]
更新时间:2020-05-07 20:10:33
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【推荐1】
年是癸卯兔年,“瑞兔呈祥”,小明同学查阅资料后得知,兔子的耳朵有很多功能,其中包括通过竖起耳朵利用风来散热,起到调节体温的功能.小明用图
中的七巧板拼成图
所示的一只奔跑中的兔子,已知小正方形
的边长为
,点
是边
的中点,通过旋转“耳朵”这块七巧板,可以将“耳朵”耷拉的状态转到竖直(如图
),在旋转过程中,耳朵尖的点
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的距离
的最大值为( ).
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【推荐2】如图,将矩形ABCD绕点C顺时针旋转90°得到矩形FGCE,点M、N分别是BD、GE的中点,若BC=7,CE=1,则MN的长( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/22fd70bb-2937-4ab1-a748-64acdc257a4c.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/22fd70bb-2937-4ab1-a748-64acdc257a4c.png?resizew=138)
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【推荐1】如图,在平面直角坐标系中,点
分别在
轴负半轴和
轴正半轴上,点
在
上,
,连接
,过点
作
交
的延长线于
.若
,则
的值是( )
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【推荐2】如图,
,
是平行四边形
从对角线
上的两点,
,连接
并延长交
于点
,连接
并延长交
于点
,连接
,设
的面积为
,
的面积为
,则
与
的关系正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/4/21/2446230174334976/2446442580385792/STEM/9ad97eafee114b3ebe62e6c2a8f1ac8a.png?resizew=173)
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