问题描述：
如图四,已知角B=角C,AB=DE,要推得三角形ABC约等于三角形EDC (1)若以SAS为依据,缺条件_________ (2)若以AS
如图四,已知角B=角C,AB=DE,要推得三角形ABC约等于三角形EDC
(1)若以SAS为依据,缺条件_________
(2)若以ASA为依据,缺条件_________
(3)若以AAS为依据,缺条件_________
如图四,已知角B=角C,AB=DE,要推得三角形ABC约等于三角形EDC
(1)若以SAS为依据,缺条件_________
(2)若以ASA为依据,缺条件_________
(3)若以AAS为依据,缺条件_________
问题解答：
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