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3、15 ABCDEF . .161. .2. BCE CBF :CBE= , BEC= ,BE= , CE= .3. : (1 ( . ( ) (2 ( . ( ) (3 ( . ( )(4 ( . ( ) BCFCFBFCFBXX 174. . . . 5. ABDCDBABDCDB AB=4AB=4AD=5AD=5 BD=6BD=6 BC=BC= CD=_CD=_. 18 .191. ABCDECABCDEC B B E E A A D D .2. ABDACEABDACE C=45C=45 AC=5AC=5 AE=3AE=3 : = =B B = = DC DC , , . .A AE EB BC CD D2 245 45 DBEAC3 35 53 3201. ABCDEC CA CD CB CE ACD BCE DBEACABCDEC, DCE = ACB ACD = DCE 1 BCE = ACB 1 ACD = BCE1 1212. AOCBOD ACBD .22