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1、,A,B,C,F,D,E, ,1:,塢1,2, , , ,A,B,C,A,B,C,A,B,C,A,B,C,ABCABC A=A AB AB = AC AC. :ABCABC.,.,., 2, ABCABC A=A ABCABC.,(),ABCADE AD:AB= AE:AC . ABCADE .,A,B,C,D,E, ,A,B,C,A,B,C, ABC ABC.,.,., 3, ABC ABC ABC ABC.,.,(), , , ,.,.,A=120AB=7AC=14 A=120AB=3AC=6,1:ABCABC.,1)A=120AB=7AC=14 A=120AB=3AC=6,ABCABC.
2、,A=A,AB=4 BC=6 AC=8AB=12, BC=18, AC =24.,1:ABCABC.,2)AB=4 BC=6 AC=8AB=12, BC=18, AC =24.,ABCABC.,ADCACB, A=A, ,ADCACB.,ADCACB, ACAB ,ADCACB., ,1:,塢123.,2,1ABCDOAODO=BOCO AOCBOD,C,A,O,D,B,2.ABCDPBCBP=3PCQCD ADQQCP,A,B,D,Q,C,P,aABEG AE ,aABEG AE ,aABEGGEFH AF ,aABEGGEFH AF ,aABEGGEFH HFCDAC ,aABEGGEFH
3、 HFCDAC ,ABEG GEFH HFCDa. AEFCEA.,1ABEGa AE= a . AEFCEA AEEF= aa= . ECEA=2a a= . AEEF= ECEA. AEF=CEA, AEFCEA.,2: AE= a AF= a , AC= a . AEFCEA AEEF= aa= , ECEA=2a a= , CAAF = a a= , AEEF= ECEA= CAAF. AEFCEA.,1.44ABC DEF 1 1ABC =_ BC =_ 2ABC DEF ,2.5 5ABC DEF,3 5 5 DEFDEF ABC , 5 5DEF DEF ABC ,1棺 2 3, ,2, , , abc ABC ABCabcABCABC.,a,b,c,a,b,c,A=A,C=C,B=B,C=C,ABCABC,
