12.2.2 (SAS),1,2 SSS,:AB,A,B,A,B,C,E,D,ABC,ACDCD=CA,BCECE=CB,ED,DEAB.,1. MAN = A,2. A M A N A B = AB A C = AC .,3. B C ?A B C .,ABC A BC A = A A B =AB A C =AC., . SAS ,S A,1.,2. (1)AOBDOC,AO=DO() _=_( ) BO=CO() AOBDOC , AOB, DOC,SAS,C,A,B,D,O,1,: :AC=AD ,CAB=DAB. : ACB ADB.,A,B,C,D,: ACB ADB ?,1,: ,AC=AD ,CAB=DAB. : ACB ADB.,A,B,C,D,: ACB ADB. ? ?,1,: ,AC=AD ,CAB=DAB. : ACB ADB.,A,B,C,D,: ACB ADB. ? ?,1,: ,AC=AD ,CAB=DAB. : ACB ADB.,A,B,C,D,:,ACB ADB,AC = A D () CAB=DAB A B = A B (,ACBADB,SAS,A,B,C,E,D,ABC,ACDCD=CA,BCECE=CB,ED,DEAB.,裺,?1. ?2. ?3., 3.AB =AC AD = AE . ABE ACD.,: ABE ACD ,AB = AC,AE = AD,A = A, ABE ACDSAS., ,1._ SAS,2.: .,1.AB=ACABD ACD?,ABD ACD,AD=AD,AB=AC,BAD= CAD,S,A,S,2.D ABEACBECDO,ABE ACD,S,A,S,AB=AC,A= A,AE=AD,ABE ACD?,2.D ABEACBECDO,S,A,S,OB=OC,BOD= COE,OD=OE,BOD COE?,BOD COE,3.ACB ADB ,A,B,C,D,ACB ADB,S,A,S,ACB ADB,AB=AB,CAB= DAB,AC=AD,3.ACB ADB ,A,B,C,D,ACB ADB,S,A,S,ACB ADB,AB=AB,CBA= DBA,BC=BD,