新思维的题如图 △ABC为等边三角形,D,F分别是BC,AB上的点,且CD=BF,以AD为边作等边△ADE.问当D在线段BC上何处时,四边形CDEF为平行四边形,且角DEF=30°?请证明 答案说D是在BC中点时
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![新思维的题如图 △ABC为等边三角形,D,F分别是BC,AB上的点,且CD=BF,以AD为边作等边△ADE.问当D在线段BC上何处时,四边形CDEF为平行四边形,且角DEF=30°?请证明 答案说D是在BC中点时](/uploads/image/z/10339646-14-6.jpg?t=%E6%96%B0%E6%80%9D%E7%BB%B4%E7%9A%84%E9%A2%98%E5%A6%82%E5%9B%BE+%E2%96%B3ABC%E4%B8%BA%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2%2CD%2CF%E5%88%86%E5%88%AB%E6%98%AFBC%2CAB%E4%B8%8A%E7%9A%84%E7%82%B9%2C%E4%B8%94CD%3DBF%2C%E4%BB%A5AD%E4%B8%BA%E8%BE%B9%E4%BD%9C%E7%AD%89%E8%BE%B9%E2%96%B3ADE.%E9%97%AE%E5%BD%93D%E5%9C%A8%E7%BA%BF%E6%AE%B5BC%E4%B8%8A%E4%BD%95%E5%A4%84%E6%97%B6%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2CDEF%E4%B8%BA%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%2C%E4%B8%94%E8%A7%92DEF%3D30%C2%B0%3F%E8%AF%B7%E8%AF%81%E6%98%8E+%E7%AD%94%E6%A1%88%E8%AF%B4D%E6%98%AF%E5%9C%A8BC%E4%B8%AD%E7%82%B9%E6%97%B6)
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