1.已知:等边三角形ABC的边长为a,在BC延长线上取一点D,使CD=b,在BA延长线上取一点E,使AE=a+b,求证:EC=ED
2.已知:如图,E.F是DA.BC延长线上的点,AD=BC,AB=CD,∠E=∠F,求证:EB平行DF
1.已知:等边三角形ABC的边长为a,在BC延长线上取一点D,使CD=b,在BA延长线上取一点E,使AE=a+b,求证:EC=ED
2.已知:如图,E.F是DA.BC延长线上的点,AD=BC,AB=CD,∠E=∠F,求证:EB平行DF