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1、12.2 (),B,C,裻 ,1,2 ABC DEF,AB=DE, CA=FD, BC=EF, A= D, B=E, C= F,AB=DE, CA=FD, BC=EF, A= D, B=E, C= F,1.ABC DEF 2.,ABC DEF?,1.,3M,3M,1.,45?,2.,45?,:.,2.,4cm6cm ,6cm,6cm,4cm,4cm,:.,4cm,30:,4cm,4cm,30?,30?,:.,3045,:., , ,3.,3cm4cm6cm ,1,ABCABC , AB= AB ,BC =BC, A C =AC.ABC ABC,: 1. BC =BC;,2.
2、B C,BA,CA,A;,3. AB AC ., SSS, ,?,ABCDEF,A,B,C,D,E,F,AB=DE AC=DF BC=EF,ABCDEFSSS,A,C,B,D,DBC,BD=CD,ABDACD,AB=AC,BD=CD,AD=AD,ABDACDSSS,1 , ABCAB=AC,ADABCD ABDACD,B=C,B=C,裺,裺,BC,CB,DCB,BF=CD,1, ABCDCB AB = CD AC = BD =,ABC ,SSS,1AB=CDAC=BDABCDCB,=,=,=,=, BD=FC,2AB=ADBC=DC ABC ADC,A,B,C,D,AC,AC ( ),AB=A
3、D ( ) BC=DC ( ), ABC ADCSSS,ABCADC,=,1,31 AC=FEAD=FB,BC=DE ABCFDE, AD=FB AB=FD ABCFDE ,AC=FE BC=DE AB=FD ABCFDESSS,C=E ,=,=,?,?,2 ABCFDE, C=E ,ACEFDEBC,4:AB=AC,DB=DC, B =C,A,B,C,D,ABDACD,AB=AC (,DB=DC ,AD=AD ,ABDACD (SSS),AD, B =C (,5: , ABCDAD=CB,AB=CD A C,A,C,D,B, 蹹,1,2,3,4,AC=AD,BC=BD, ABDAC., AC=AD( ),BC=BD( ),AB=AB( ),ABCABD( ),1=2,ABDAC,SSS,壩,:ABCABD,1. SSS,2.),3.: () ().,1. . 2. .,:,3. (:),
