精品解析20212022学年人教版八年级数学下册第十七章勾股定理专题测试试卷(含答案详细解析)

经典word整理文档，仅参考，双击此处可删除页眉页脚。本资料属于网络整理，如有侵权，请联系删除，谢谢！人教版八年级数学下册第十七章-勾股定理专题测试I第I卷（选择题30分）3由490，，）cm2abbaab、（>+AABCDABcmADcmBC，，，cmCDcmAABCD）cm22）222＝ABCCBCAAC）341353ABCADBC，，⊥于DAD点）52AB12cm3cm取）A．151cm24cmABCCBAABABCABSSSSSSSSSS，，，，++++）123451234533，ABAC5，、长BC8DBCCBADD）个个个个第Ⅱ卷（非选择题70分）4，，BMCM是CABCABACBCBDAC＝为BDAB6ABABBDD，，ADBDCD42ABDC的DAAACCDBBC．ABABCBCDEABBC、、﹣＝．DEBDDAAC222AABADBDAC：ABCCBCABCACDADBDE＝ABABDEAExDEy段、＝，＝．AyxBDEAEABCDBE∠BABCDBEDBEBBDABCBC的ADBEADDCABCBDCDADCEADCE、、与FCEAD；FACBD点＝∠ABC．ADCEFD、、FD为GCGCGCEFDACGFABCACBABBCPA4ACBAAt﹣﹣﹣PACPPAPB在＝tPBCACPtBC12，，AC13cmAB5cm，，BCACAB12(cm)221，1313451249(cm)2ab22，ab2225124，1∴，2442∴．ab2ab2ab25244922ABDBDBDCDABDBD，AABcmADcm，，BD∴=cm2ABAD34222BCcmCDcm∵，，222BDCDCB∴+=，222BDC11=××=SDBCDcm2△DBC221Scm=2△ABD2ABCDcm2BDBDC6和，6810223，2＝BCAAB32A＝BCBC，AB3AB∴AC∴＝,ABBC3252222ABACBCSABACBC2BAC，，+＝22△ABC11ACABBCAD22ABACBC，2425125345222222ABACBC∵+222ABACBC∴+＝，222BAC112S∴，BCADACAB△ABC25255AD，AD∴BAC12cm3cm，2∴BC12cm,AC39，2，ABACBC15cm22ABDDNBFNDISSSSS作⊥于++++＝12345ABCABCCBAABBCABAC∴＝1＝，3ABBC222DDNBFNDI过作⊥于，ACBBND，ACBBNDAAS（MNDOCB，MDOBDMNBOC∴＝，EMDO∴＝，DNBCCI∴＝＝，DNCI∵∥，DNCINCIDNCIDICFDIOEMFDMN，BOCDOIFMEDOIAAS（SS＝SS，△MND2Rt△DOI△BOCSSS∴+＝SS．＝，△ABC24Rt△ABC3在AGE和ABC，AGEACBHL（DNBBHD，SSSSS∴++++12345SSSSS＝++13245ABCABCABCABCABC3．3AAEBCBEDEAEADBEEC作⊥与=ADAAEBCE作⊥于，ABCABACBC=AEBCEBEC⊥，=AE∴=，ABBE5432222DBCBC∵，ADADAD∴或ADBC当D有3B.MAMB，CMAMBMC10C10(b)(a3)b2)MC(xx)(yy)210222CMCMab，MAMB，，．MAMB131022MABC∴．MAMBMC10C设，．(ab)ab0b∴∵22a33，b22．3)b2)10MC(xx)(yy)10(a22CMCM210(1)+(3)2，a31a3a33a331∴或或或，23b23b21b21ba4a2a6a6或b5b5或．b3b1C∴MAMBMC24512AEBCBCE作⊥交4BD3AE=AEBCBCE⊥交，ABAC∵＝∴ABC12∴BECE，BC4△，ABBE22543AE22211∵BCAEACBD，S△ABC2211835BD24BD．∴22524．5AEBCBE⊥BCAC∵AB∴＝2418225ABAB∴＝．(12)(24)522．582CCEBDBDE作⊥DCECDECE=DEBCCCEBDBDE作⊥，∵，，ACB90ABCCAB∵，ADBDADB=，ADCABCCDEDCECDECE=DE，∵CD42，CE=DEBD∵BE∴∴∴，BCBECE54412222，AB2BC82．82DCECDE160AB为13AB与xRtxADADAB高ADACBCAD，，BD，mBCmADxmAC＝），xm在ABBCAC+＝，RtABC222xx）），222x＝，30160ABm（故＝10=131316013AB为．4CDBD＝BDCDCD，BCDEABBC∵、、，DECDDB∴＝，BDDAAC∵﹣＝，222CDDAAC∴﹣＝，222CDADAC∴＝+，222ACDAABADBD：ADBD∴DC∴AC∴＝．CDAD422y＝或83x212x48ADBACBDA∠；DFABFDFy⊥于xBEBDBEDE＝、＝ADBD＝，ADBA，BD∵ABCCBDDBA，ADBACBD，CADFABF⊥于，RtABC在△CBCAABBC∴DADBDFAB∵＝，⊥，AF∴＝12EFx∴RtAFD在△A3DF∴＝AF，33RtDEF在△，DEEFDF222即，yx)222y＝；x12x482RtAFD△ADF，3ADBD∴＝，3BEBDAE当＝；33BEDEx当＝＝，x12x482xAEEAB与、DBDE∴≠，BDEAE或331ABCD；ADBCOABDCBE、CFOABOGEHCBEHEGEAHFCGFHGAHCGABD至=，=ADCEADCGAHFDAHCGF===∠ABCDBEBBDBE∴=ABCAB∴=BC322CDBCBD∴=-=31；ADBCO、点ABCDBE∠BABCDBEABCBDBEBABCDBE∴=，=∠ABCCBDDBECBDABDCBEABDCBESAS（）OABOCFAOBCOFCFOABOADCE∴⊥；GEH至=HEGEFAC∵AFCE∴=HFAGFCAHFCGFHGAHCG，=ABDCBEADCE∴=CECG∵=ADCGAH∴==FDAHCGF∠．FDACGF∠．tt3PBABBC8cm22PBPA4tcmACBCP4t8cm1CPCP2S△ACP2PB，