如图,直角梯形ABCD中,∠BCD=90°,AD∥BC,BC=CD,E为梯形内一点,且∠BEC=90°,将△BEC绕C 点旋转90°使BC与DC重合,得到△DCF,连EF交CD于M.已知BC=5,CF=3,则DM:MC的值为 ( )
![](https://img.xkw.com/dksih/QBM/2015/4/1/1573828577550336/1573828583669760/STEM/32d9eca4bd8b4c99ad64139af073713d.png)
![](https://img.xkw.com/dksih/QBM/2015/4/1/1573828577550336/1573828583669760/STEM/32d9eca4bd8b4c99ad64139af073713d.png)
A.5:3 | B.3:5 | C.4:3 | D.3:4 |
更新时间:2020-10-26 06:31:54
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【推荐1】将矩形
绕点
顺时针旋转
,得到矩形
.当
时,下列针对
值的说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/5/28/2730392185700352/2731997636182016/STEM/23bbbcb3-1b91-4b06-bd54-442b15610d0f.png?resizew=315)
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A.![]() ![]() | B.![]() ![]() | C.![]() | D.![]() |
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【推荐2】如图,已知等边三角形ABC绕点B顺时针旋转60°得
BCD,点E、F分别为线段AC和线段CD上的动点,若AE=CF, 则下列结论正确的有( )
![](https://img.xkw.com/dksih/QBM/2021/5/12/2719555029565440/2725849673310208/STEM/c93cc323-e51f-4ad5-9862-72ba6eda080b.png)
①四边形ABDC为菱形;②
ABE≌
CBF;③
BEF为等边三角形;④∠CFB=∠CGE;⑤若CE=3,CF=1,则
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①四边形ABDC为菱形;②
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【推荐1】如图,▱ABCD中,E是CD延长线上一点,BE与AD交于点F,CD=2DE,若△DEF的面积为a,则▱ABCD的面积为( )
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【推荐2】如图,平面直角坐标系中,点A在第一象限,
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