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ǰλãҳ > 2020年中考数学复习全国通用版中考数学练:《三角形综合 ?含详? - 百度文库

2020年中考数学复习全国通用版中考数学练:《三角形综合 ?含详? - 百度文库

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֡ߡACDǵȱΣ ADCDACDCA60㣬 AOEADC ߡAOE+AOC180㣬 ADC+AOC180㣬 ADCOĵ㹲Բ

AODACD60㣬CODCAD60㣬 AODCOD ODƽ֡AOC

2֤ͼ2УȡAEеMCM

AE2CFAMME AMCF

ߡCAMACF60㣬ACCA ACMաCAFSAS ACMCAF

ߡCMECAM+ACM60+ACMCFPACF+CAF60+CAF CMECFP EMCFPCFCEM CMEաPFCASA

CEPC

20⣺1ۣAD2PD ɣͼ1У

ߡABCǵȱΣ B60㣬 ߡEDC120㣬

EDB180㩁120㣽60㣬 BEDBBED60㣬 BDEǵȱΣ BPPE DPAB APD90㣬 DEDCDEDB BDCD

ABACBAC60㣬 PADBAC30㣬 AD2PD

ɣӳDPNʹPNPDBNENӳEDMʹDMDEBDBMCM

DEDCDMMDC180㩁EDC60㣬 DCMǵȱΣ

CACBCMCDDCMACB60㣬 BCMACD BCMաACDSAS ADBM PBPEPDPN

ıBNEDƽıΣ BNDEBNDE DEDM BNDMBNDM

ıBNDMƽıΣ BMDN2PD AD2PD

3ͼ3УPDKBDC120㣬PDPKPKCK

DBDCDPDKBDCPDK BDPCDK PDBաKDCSAS PBCK

PB+PCPC+CKֵ

PCKʱPKֵ󣬴ʱPDֵ

ʱDPBDKPDPK30㣬BPCDPB+DPK60㣮 ʴΪ60㣮

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֡ߡACDǵȱΣ ADCDACDCA60㣬 AOEADC ߡAOE+AOC180㣬 ADC+AOC180㣬 ADCOĵ㹲Բ AODACD60㣬CODCAD60㣬 AODCOD ODƽ֡AOC 2֤ͼ2УȡAEеMCM AE2CFAMME AMCF ߡCAMACF60㣬ACCA ACMաCAFSAS ACMCAF ߡCMECAM+ACM60+ACMCFPACF+CAF60+CAF CMECFP EMCFPCFCEM CMEաPFCASA <

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