1.正方形ABCD的一边向外做等边三角形ADE,则角BEC=?2.正方形ABCD中(图1),AF平分∠BAC.求证:EF+AE=AB3.平行四边形ABCD中(图2),对角线AC,BD交与点O,E是BD延长线上的点,△ACE是等边三角形.(1)求证四
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![1.正方形ABCD的一边向外做等边三角形ADE,则角BEC=?2.正方形ABCD中(图1),AF平分∠BAC.求证:EF+AE=AB3.平行四边形ABCD中(图2),对角线AC,BD交与点O,E是BD延长线上的点,△ACE是等边三角形.(1)求证四](/uploads/image/z/13292222-14-2.jpg?t=1.%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E4%B8%80%E8%BE%B9%E5%90%91%E5%A4%96%E5%81%9A%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2ADE%2C%E5%88%99%E8%A7%92BEC%3D%3F2.%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E4%B8%AD%28%E5%9B%BE1%EF%BC%89%2CAF%E5%B9%B3%E5%88%86%E2%88%A0BAC.%E6%B1%82%E8%AF%81%EF%BC%9AEF%2BAE%3DAB3.%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%EF%BC%88%E5%9B%BE2%EF%BC%89%2C%E5%AF%B9%E8%A7%92%E7%BA%BFAC%2CBD%E4%BA%A4%E4%B8%8E%E7%82%B9O%2CE%E6%98%AFBD%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%E7%9A%84%E7%82%B9%2C%E2%96%B3ACE%E6%98%AF%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%E5%9B%9B)
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