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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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16֤1ͼ1УDHABH

ߡACDAHD90㣬ADADDACDAH ADCաADHASA ACAHDCDH CACBC90㣬

B45㣬 ߡDHB90㣬 HDBB45㣬 HDHB BHCD

ABAH+BHAC+CD

2ͼ2УBMADADӳMCM

ߡACBAMB90㣬 CABMĵ㹲Բ AMCABC45㣬 ߡCEM45㣬 CEMCME CECM

ECMACB90㣬 ACEBCM CACBCECM ACEաBCMSAS AEBM

RtEMBУMEB30㣬 BE2BM2AE

3ͼ3УCHMNH

ߡACBAMB90㣬 CABMĵ㹲Բ AMCABC45㣬 CNCM NCM90 CNMCMN CNCM CHMN HNHM

CDDBCHDBMD90㣬ADHBDM CHDաBMDAAS DHDM HNHM DN3DM

17⣺1ͼ1УAKCDCDӳK

CDBMAKCKACB90㣬

CHBK90㣬CBH+BCH90㣬BCH+ACK90㣬 CBHACK

CBCA

CHBաAKCAAS AKCH

ߡCHMK90㣬 MHAK AMBM CHKH AKKH ߡK90㣬 AHD45㣮

ͼ2УAKCDCDӳKCMABMDHCHa

CACBACB90㣬 CAB45㣬

ߡAHD45㣬AHDACH+CAH ACH+CAHCAH+DAH DAHACD ߡADHCAD ADHסCDA

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OABCOBOC ABACDBDC ABCACBDBODCO ABDACD ߡCEGABD ACDCEG DHCE HDGCEGDCH ߡDHGDHC DHGסCHD ࣽ x2 AHCH2 H22 GHGC G31 16֤1ͼ1УDHABH ߡACDAHD90㣬ADADDACDAH ADCաADHASA ACAHDCDH CACBC90㣬

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