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2、BED90. BDECDF BDECDF(AAS) BECF.,1, ,1, ,1 . 1:CBD B =D =90 AB= CD1=E 2AB = DB, BC =BEABC=DBE.,1,1,2 BDCEBCBDF CEF( ) ASSS BSAS CASA DAAS 3 ()ABCDCB ABCDCB( ) AAD BABDC CACBDBC DACBD,4 ()ABC DCB( ) AABDCACDB BABDCABCDCB CBOCOAD DABDCDBCACB,1,5 ADEACCE123. ABDE.,1,2,2,3 BC ABDACE( )_ _ BCA AASASA ABACADAEBDCE ABAC ADAEBDCEBE CD.,ABACADAEBDCEBECD(),2,1 ( ) A B C D 2 ( ) A B C D,3 ABCDEF ABDEBCEFACDFADBECF. ABCDEF( ) A B C D,2,2,4 ABACABE ACD_( ), (1) (2) (3) (4),