如图a,ABCD是长方形纸带(AD∥BC),∠DEF=19°,将纸带沿EF折叠成图b,再沿BF折叠成图c,则图c中的∠CFE的度数是________ ;如果按照这样的方式再继续折叠下去,直到不能折叠为止,那么先后一共折叠的次数是_______ .
更新时间:2016-12-06 00:36:40
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【推荐1】如图,在矩形ABCD中,点E是BC上一点,将△ABE沿AE折叠,点B落在AD上的点F处;点M是CD上一点,将△ADM沿AM折叠,点D与点E恰好重合;若AB=1,则DM的长等于 _____ .
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【推荐2】如图所示,将一张矩形纸片
先沿着
折叠,使点A刚好落在
边上点G处,再沿着
折叠(其中点F为
上的一点),使点C恰好落在
上点H处,连接
,若
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c69a9feb14d4b9ccba6ae42837fd73.png)
______ .
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