新人教版八年級(jí)(初二)數(shù)學(xué)下冊(cè)同步測(cè)試題(強(qiáng)化復(fù)習(xí)資料)

1、x二次根式xxx(7)(x,ax;.xxxxxxy;.bbbabcabc(b)beqoac(,20)ABCabcabbbABCcxyx(xxxx2;3);b;b(;.bbabababababbxyxyxxxx;,babababababbb;bb;bbxyxy2,，與，與bbbabbb(.(bbbbbbbb.xxnnabamnmnmmnbbbbb(.ababab*babbbbbbbb().bb.xxyyxyxymna;a;axxxxxxxx;abccxy6;b.;b;2;.;2;2;b;b.7;.aa3;(2).b.,nn(2;.mnmmnPmn:a,(xxabbababbbB已知AByxABB

2、,bbbbbbbbbbbaABCDADBC，Aeqoac(,90)，BCDADABCD;nn用.b.x;nnnnnnn.勾股定理abccABCCabcABCabccabAacbAabcABCeqoac(,Rt)ABCBCABACBCABCABACBDACDCBDeqoac(,Rt)ABCCABADECBCFGeqoac(,Rt)ABCCABCabcabcabacbABCcabacAcchabcabcxxlABCDBAClSSSSSSSSABCCABDABCADBCeqoac(,14)ABCCSSSSSSSSSBABADAABACAABABCDABACBDCDCDABCDOW在ABC中，若ABA

3、CBC，則ABABCE在ABC中，若ABACBC，則BCADACBE在ABC中，若ACBC，ACBAB，則ACABCDABCABBCCAeqoac(,a)ABC在ABCACBACBCABCD，則ACABBCAEeqoac(,Rt)ABCCDEBCACADBEABeqoac(,10)ABCAACABABDCDDBACABBDABCDEFDBABADBEADDBCFABBCECeqoac(,13)ABCCDABEFACBCDEDFAEBFEFeqoac(,14)ABCABCABBClllllllACABCDACACEFAEAEGHABCDSSSSnnSnSnabcabcABCabcABCabcca

4、bccabccABCbabacBeqoac(,1)ABCaaaaaABCabcabccabcb,bbnnmmneqoac(,12)ABCDBCABADACBDCDABCDABBCABBCCDADABCDABCDFDCECBCEAFFECBBMPeqoac(,16)ABCabcabcABCabcABCacbcabnababacSSSSSSSSSACDAABCDO.BDDCmCEEAkkmkmABm,BDBDxCDxeqoac(,Rt)ACDxxxBEBExDEBExAEADDExABEABAEBExxxECECxDEEFxAFADBFCFeqoac(,Rt)xxxFDMDMDFAMEMAClMN

5、AMBBNCaacCDAEaAFEFAEAFEFAEabcababcnnnnnBCAABCACBBCABCABCCOABCODBCOEACOFABDEFBCCAOABACBCABBCABACADBDABCABACABCDBCABACBCADeqoac(,2)ABCabcaaaaaABCDABBCABCCDABEADEABCDBEeqoac(,Rt)ABCCCDABDABCD，則ACBCeqoac(,13)ABCCABABACADBCDADABCDABDABCDeqoac(,15)ABCABACPBCAPPBPCPeqoac(,16)ABCABACBCADBCABAnB、圖BACEBDxDEBD

6、xAEABCECDxeqoac(,Rt)CDEADEDEADeqoac(,BE)ABEeqoac(,Rt)CEABECEBE7,ADBCADEAAHBCHAPPBPCAHPHBHPHCHPHAHPHBHPHAHBHAB.eqoac(,Rt)ABCACBACBCABACDABDABADCDCBABDABBDCDABDABADBDxCDxxABD平行四行形ABCDeqoac(,在)ABCDABABeqoac(,若)ABCDACDABACBDABCDCEABEABCEABCDDBDCACEBDEBCEABCDAABADeqoac(,S)ABCDABCDAEABCDAEBADFAFEFABEFAEAF

7、AFBEABCDABCCADBCADBCAADCABCDABCDDEACEBFACFDEBFABCDABCCDEADEABFAFCEEFABCDABCDDEFBDECBGCBBGABCDEFACAECFBEDFBEDFABCDABADDABAABxBCDABCDABCDABCDEFABCDACBDOACBDABABCDAEAFBCCDEFEAFABAD，則CDABCDADBC；Deqoac(,)ABCDOAOBBOCABBCeqoac(,在)ABCDACBDOOAxACxOCeqoac(,在)ABCDCAABBADBCACABeqoac(,在)ABCDAEBCE，若ABBCBE，則ABCDAB

8、Ceqoac(,在)ABCDAAAACCCCABCDBBDDBCDAABCDeqoac(,，則)ABCDnnnnnnnABCDDABEEABABCDABDABBCABCDCEABECFADFOeqoac(,為)ABCDACOABCDOMNEFMNOEOFMAENCFABCDEACAEECFABBFeqoac(,AF)BEFeqoac(,，求)ABCDABCDABCDabcdabcdacbdABCDACBDACBDOBOCOAODOABCDABCDACBDOABCDABCDBCADABCDBADBCDABCDOAOCABCDDBACABABCDABCDEFABCDAECFMNDEFBENFMAB

9、CDEFADBCAECFAFBEGCEDFHEGFHABCDEFBADCAECFPQDEFBEQFPABCDEFDABCAECFFABERECDFSRESFABCDABDCADBCEBCFADAFCEEFBDOOBDeqoac(,14)ABCDACEBCABEEDFAECFCFAEeqoac(,15)ABCDABEACEFABDFBEDFAEABCABCABCDCEDFABEFABCDEFABGHADMNADAEFDEBCFABCDABCDADBCABCDABCDABBCADDCABCDCDABABCDABCDEFABCDABCDABCDADxACABCDACBDeqoac(,O)AODBEC

10、OAABCDEFACAECFFeqoac(,13)ABCEFABCDBCBCADEFOEFDFAEDFeqoac(,14)ABCABACDBCDFABACFDEACABEDEDFeqoac(,15)ABCDFCBBACDBFADADEACDCBFCDEFyxAABAOBPPAmmBmmmkMxNyABMNMNeqoac(,在)ABCDBCABEBCAEDeqoac(,在)ABCDxeqoac(,)ABCDACBDOABACABCeqoac(,60)OABM如圖，在ABCDBCAMBDADeqoac(,，則)ABCDMeqoac(,)ABCDACBDOBOCADBDeqoac(,，則)ABCDA

11、BCDABAD，BADBCE，交DCFBGAEGAFCEFBDABCDMNADABMNBDeqoac(,S)DMCeqoac(,S)BNCeqoac(,10)EFCAEFABECADFCEADFABABaADbEFCECFCeqoac(,11)ABCABCBDACDAEBACEFDCBCFBEFCABCDEADCEBAFBCCDFBCFABCDAEFABCDABADBFBDMPQPAxQByABQMOMOeqoac(,Q)OBQOAPQOPOQOPCQOPCQABCEFGABACBCABCEFEGGFeqoac(,A)BCABCEFGeqoac(,A)BCnDEABCABACDEADAE，則A

12、BCDEABCDEFGHABBCCDDAEFGHABCBDCEOFGOBOCDEFGEeqoac(,為)ABCDDCCEDCAEBCBDFGACBDOOFABOFABCDECDFAEFCBEGGFGCABCDADBCEFDCABFEADBCHGAHFBGFABCDBCAEBACBEAEEABACEDeqoac(,10)ABCDEABACBDCEMNBECDMNABPACQAPAQABCDACBDOAOBACABBCABCCACBCABCDABCDADABDDEAABCAEABABCDABBCACADBCEFCECEACABCDABCDACBDOOABOBAABCDBEACECFBDFBECFe

13、qoac(,11)ABCDBCEADABCBEFAFDCCFDBCABACADCFABCDABBCBDEFABCDEFBCABEFEDEFEDAEBADABCDABADCDEEBAECPBCBPCPEPABFABBFPAEPFBPABCDEFABACEFABCDABCDABABCDEABDEABABABCABCDABCDABCEABPACPBPEABABCDEFABCDDEBFBDADECBFADBDBFDEABCDABCDACBADCEADABEAECDEABABCABCDABACABBCACBDOACOBCADEFABEFAFECBEDFACOABCDBDEFADCDAECFBDEBCFB

14、EFBEFSSABCDBADBCDADABCD，使B；作ADBCD，以ADABCDBnABnCnDnADnaACEFABCDACEFABCDABCDBCECEACAECDFAFCBCACEEGABCDBCEFACEGBDF，如果EGEFEGABCDADCEDEPQPQABCDABCDEMNABBCADCEMNMCEANMEABCDACAEABEFACBCFBFECABCDCEFCGEFADHDHPABCDPEABEPFBCFDPEFABCDPABABDPACQPABADQABQPABADQABCDPABBCCPADQABCDeqoac(,12)ADECBFeqoac(,13)ADFCBEAED

15、CFBGEBDEAeqoac(,15)ABECDFBCDFFHABADHDCGEFFGGHHEEFGHFFHABADHEEGADDCGEFFGGHHEEFGHADHDHCFCDGEFFGGHHEEFGH)acbdABQPQMMNPQDCNQMPNQMNPABACAOABBCADBDBCBCxAByAOMCONAOECOFAMECNFABCCDAOAOCOEeqoac(,OF)OAEOCFEAOFCOABCDABCDBAODCOEAMNCF,bd.ADBCBFDEEMNFAFCEBFDEGEFHGFEHEBFDEPQFEBFDREASFCRESFBFDEBEDFAFCEDFAEDEAFADEFB

16、FDFBFDEBEDFDFBFDEBFDBCDEDFABCACCBACDCBFCDeqoac(,BF)ACDCBFACDCBFADCFCADBCFAEDADEADDEFCDEEDBBDACADACDBCFEDBBCFEDFCEDFCCDEF(,PPmkx提示：作DEAMBCE，作DFBEeqoac(,F)，可得BDEDFCEBDEOExBECEBCxeqoac(,S)eqoac(,S)BCDBDCEBMDNEFECFCabEEMBCDCeqoac(,M)AEBAEMDCAFeqoac(,DE)ADEADBABDykxMQMOQm)SOBQOBBQOBBQmmmSmOAPmQQQOPCQOPCQ

17、OQPCP，OPOPCQOQQQQnOQnnnnOQOQOQOQOQOPOPCQOPOQnBDACBECEABABECBFFCABCDAOOCABOFBEPEFPCACACMMEMFEMFMEDBEACFAPAQBCHMHeqoac(,NH)MHNAPQAQPOAOBACBDBOECOFADCFeqoac(,13)BFECEDBEDCABBAEAEBADDCEAEBEAEABEBAECBEFBFEBEABABBEBFBFDEABCeqoac(,Rt)BEDFBEFBEF()n.aDDFNMBCFAFCHDHBPADQABQQAQEyEQFxFQADQESQEQACQ(,)D(,)y2xyxPA

18、BADQABCDADQQDQADADQAQADPBABCDQDQAADQPCQCDAeqoac(,DQ)ADQPBCCPxADAQADBCADQCPQAQDCQPADQAQDCQPCPQCQCPxACAQADxCQACAQCPADQeqoac(,在)ABCDABADAABCDABCDAECF若AB，則BCABCDEBCFBCABEFABCDACABCDABCDABCDEABBEAEPBDPEPAABCDOABAOABCOABCOOABAOABCOABCnOnABCDEFBCADAFCEAECFABCDBBCADEBECCFBEFBFBFABCDBDCEBEADFABFEDFFBCMDMBMDFABCDADBCEFGHDBBCACDAHFEGABCDADBCCECDFBCFAEDAEAEFABCDADBCCFBCPABABAPCBPDPCPAPDPBAPCBPDCDEFGHACABB