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3,1. Zx xk,2. ?, .,.,岻,C,B,E,A,D,Zx xk,ABC A/B/C/A/B/=AB A/ =A B/ =B . A/B/C/ABC ,5, ABC A/B/C/ A/B/AB A/ =A B/ =B .,2. A/B/DA/ B/ =A EB/A/ =B A/ DB/EC/.,1. A/B/AB,A/B/C/.,Zx xk, (ASA.,5,Zx xk,ABCDEFA=D B=E BC=EFABCDEF,6,3 DABEACBECDOAB=ACB=C. BD=CE Zx xk,1.ABABBFCDBC=CDBFDEA CEDEAB.,2. ABBCADDC1=2. ABAD.,1. ,2.,3. .,