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—Why me ? Mike is sitting there doing nothing.
如图,在矩形纸片ABCD中,已知AB=1,BC= 3 ,点E在边CD上移动,连接AE,将多边形ABCE沿直线AE翻折,得到多边形AB′C′E,点B、C的对应点分别为点B′、C′.