湖北省武漢市洪山區(qū)2019-2020學(xué)年八年級(jí)上學(xué)期期中考試數(shù)學(xué)試題-含解析

2019-2020學(xué)年八年級(jí)（上）期中數(shù)學(xué)試卷WUHANW）UHN）cmcmcmcmABCPPABC（）ABCDEF）DFEFEF）ABCABcm和）cmcmcm或cmcm或cmC在yABCCABCD沿BDC與EADB，則BCcm．DABM是ABCMD則CD）6xP．13．ABCBCcmABEF交ACD為BCMEFDM2．ACBACBAICABBIABCI作AB于ABI．ABCDBDABCACBABCBADCADBDC．8F在ABAE．ABCABCBD是ACDBCABCDBADBCDE在CDBACDAEAC與AEABCx′yPCP的′′．．ABCCDABCE在CDAEDBCD．．CBEACDCFABCACED為CFDA．ACBADB；；ECF．ABCDDEFM是EFE在ABFBCCFCFME在BCBE）yxOA比OBAOBDm和nC為AODC與ABDE．GADH為GBHAN交y點(diǎn)HANHBOHB參考答案與試題解析WUHANW）UHNWUHN．）cmcmcmcmABCD．ABCPPABC（）ABCPP在ACABCPPC，PABC．ABCDEF）DFEFEFSSSSASASAAASHLDE，SSSABCDEF；，SASABCDEF；，ASAABCDEF；SSA．34ABCABCPABCP作，，，PABCABC344．ABCAB）AEDADCAD，AEDADE，AEDADE，，．cm和）cmcmcm或cmcm或cmcm；cm．cm或．．C在yABCC當(dāng)BAABCC有2當(dāng)ACABCC有1當(dāng)CBABCC有1C在yABCC有4．ABCD沿BDC與EADB，則BCcm．EBDDBCABCDADBDBCABCD沿BDEBDDBC，ADBDBEEHDADBDBEEDH，，，，．DABM是ABCMD則CD）ACMBDMACMBDMCMDAMCDMBCMADMB+CD．6xPP．11xP1Px1P137．，或ABCBCABEF交ACD為BCMEFDMcm．ABCD是BCADEFABBEFADMD，ABCD是BC，S＝BC＝，△ABCEFABBEF，ADMDDM，．ACBACBAICABBIABCI作AB于ABI．IABC＝AICABBIABC，I，SSSS，△AIB△BIC△AIC△ABC∴即S＝△ABIABCDBDABCACBABCBADCADBDC．BA和DBA于EDBC于FBD是ABCBDEBDFDAC于GADEADGCDGCDFCDACFDCABA和BCDBA于EDBC于FBDABC，BDEBDFASA，BADCADBADEADCADEAD，ADEAC過(guò)DAC于G在ADE與ADG，ADEADG，．在CDG與CDF，CDGCDFCDACFACBDCABDCCBDDCAACB8F在ABAE．由BFBDSASACF≌BDE．，，，，ACFBDE中ACFBDESAS．ABCABCBD是ACDBCABCABCDBCABC，ABCABC又BD是ACDBCABCDBADBCDE在CDBACDAEAC與AEASAABCADEAC；BADBCDABCADCADEADCABCADE，，ABCADEASA）BACDAE，BACCADDAECADCAE．ABCx′′′．yPCP的．xCyy．PABCCDABCE在CDAEDBCD．．CBEACDCD到SASADFBDC，BCDDEBDBEDCBDEBACBABCDEBCD到CD，CDABCADFBDC，ADFBDCSASBCD，AEDBCD，AED，，；＝CDABC，DEBDBE，ABCDBECBEDEBDEBDCBCBE，DCBDEB，ACBABCDEBACDACBDCBCFABCACED為CFDA．ACBADB；；ECF．DCEDAMDBN，DAMDBNDMCDNC得出ACADPBDCAPDCE，CFABCACE，在DAM和DBN，DAMDBNDAMDBN，ACBADB；DM，在DMC和DNC，DMCDNC，+，，，，．CADCBDAC，，ECFACFCDPDPCAPDECFBCDADPBDC，ADPBDCAAS，，，．ABCDDEFM是EFE在ABFBCCFCFME在BCBE2）ADECDFSASADECDFDCFCM交BC于CMEFNBCMBNEADECDFBNBENBNEBCMCMFCFM＝BCMF作BC于AD于CGQDE作AD于，則CM交CG于QDFHEDAASQDFDAASCGQDCMENFGCMGNFDM是EDFGM是EGFSSSCMDCMGDCMGCM＝DCGNGFABCDBCDADCDEFEDFADCEDF，ADECDF，，ADECDFSASDCFEBCCM交BC于2M是EFCM，CMEFNBCMBNE，ADECDF，，，，BENBNEBCM，CMFCFM＝BCMF作BC于AD于CGQDE作AD于，作CM交CG于3EDFHDEQDFHDEHEDQDFHED，，QDFHEDAAS，，CGQD，M是EFCM，CMENFGCMGNF，，DM是EDFGM是EGF＝＝，，，CMDCMGSSSDCMGCM＝DCGGNFNGF＝，．yxOA比OBAOBDm和nC為AODC與ABDE．GADH為GBHAN交y點(diǎn)HANHBOHBDACAOB．ABCACBABHACNAAS，．2，，DACAOB，DACAOBSASADCBAO，ADCACDEACACEAEC，S＝＝，，．OBABCACB，，GABGBA，GADyGABABC，ACBEBA，GBAACB，ABGACN，GANGBO，AGBANC，ABGACN，ABHACNAAS，，H在GBHB，．2，，DACA