福州市八年級(jí)上學(xué)期期末質(zhì)量調(diào)研數(shù)學(xué)試卷及答案

數(shù)學(xué)試卷第Ⅰ卷4ABCD．2．8．41D．2D．a(chǎn)aa．(2)6a3a35510．a(chǎn)aaD．()a3412824．如圖，已知△點(diǎn)，，DE△ABD≌△．BCA．ABAC．CACD．BDCEBDECD．BAECADm1．m2m1．m122D．(m1)2(m1)1．mm22xy1xyxyxy．．D．y22x2211111xyxyyxxyxy22．()xyxy()2(3)(4)x2x2．72x．27．1D1x△ACBC，＞＞PPAPCAB．是PACA．是PBC．PACBBC．PBAC(acb)21，(acb)2019222a2b2c2D第Ⅱ卷64x2．xx21x1．x，2．xABCD中AEB沿FEBEABEDCBEDCBF是F3xy3082．xyDA16ABC中CD，是BCEDDEDCBDBE63CE23．BCE981xy9y2m4m4）（）．2285m323．m3m32m98(mn)(mn)(mn)2m21，n21．22m8△CD△，與≌BADBC．EE△ABEAB8ACB，ABC，CDACB．；lDAC）l與，CD，AC4EF時(shí)B月初花費(fèi)的元ACCBB要））x122xx1MN．，0與0MNx2MN．y3yxyxABC，，是ABBCDBCECE作CE．DBC2F；DC，CDBAADC(D)BBCFFEE圖1圖2數(shù)學(xué)試題答案及評(píng)分標(biāo)準(zhǔn)41A2A3B4D9B5C10A6C7D8A411．21211332）x33181415．16．9171(3)·········································································1分22yxy(x3)(x···································································4分2(m4m4)····································································1分2(m2)．········································································4分232(mm2918[]m···························3分····································4分··········································6分(mm(mmm32(mm(mm(mmm3(mmm3m3(mm1．············································································8分2329()m··················································1分m3m35m3(m3)(m3)5m3(m3)(m3)5m323·······················2分m3m32(m3)3(m3)·······················································4分5m35m32m6m95m3····························································6分5m35m3·······································································7分1．············································································8分192nm·······················································4分2mnm22222mn．······················································································5分當(dāng)m21n21，································································6分分2(21)(21)····································································72[(2)1]2222．··························································································8分320≌BAD，∴CBADAB，·········································································4分∴，··················································································8分∴ABECBADAB”ABE2211）lDACB···················································································································2分·································3分l2EC．lDFAE∵ACBBAC4，，，12∴∴，AAB，ACAB．·····················································4分8∵是12∴AEAB4，AEF，∴AEAC，∴∴AEC···································5分ACEECAC4，，∴FECAEFAEC．··················································6分∵CDACB，12∴ACF45，ACB∴ECFECAFCA，····················································7分∴EFCFECECFECF，∴EFEC．·········································································8分4221x··············································1分24000150001.5x10·····················································3，分xx100．··············································································4分x100····································5分月初購(gòu)進(jìn)英語(yǔ)點(diǎn)讀筆1002y········································6分1月份每支點(diǎn)讀筆進(jìn)價(jià)份每支點(diǎn)讀筆進(jìn)價(jià)是150101601001.5150(y·········································8，則分分·············································································9．y元．·································10分ABCABACACCC，．23，ABC≌△．········································································4分ABCADCBDCBABCABC中A作ADBCDA作D·················5分ADBC∴ADCDCADBADB，··································6分在和△中ACDCC，C，AC，∴≌△·····················································7分ACD············································································8分∴ABDRtBD中．在和，，ABDRtBD≌（B∠B．···········································································9分在和△中ABCCC，B，，AC∴≌△·····················································10分ABCDACCBBABD≌ABC△，，···················································································5分CD∴ADC，ADBACB，BDBC．·································6分∵ACAC，ACB，ACB∴ADAC，ADBACB，∴ADCACD，·····································································7分∵，ABDADBC∴ADBADCACBACD，即BDCBCD，∴BDBC．··············································································8分∴BCBC，·············································································9分∵，ACAC，∴≌△······················································10分ABC24100．·····························································1分MNx(x1)2x1xx12x2MN，······································3分∵0，x(x202(x0≥，＞，∴∴(x2x0，·····························································4分∴0．······························································5分MN42x24x1x2··················································6分yx1x12x4x1即33x1············································7，分y················································8分1x．31yx2x42x222x1②2．···············································9分yx1x1∵，yx2x1∴∴x可以取±12．121當(dāng)11x0y240；···································10分x21當(dāng)x11x2y20···················11分22當(dāng)12x1y230；································12分x22當(dāng)x12x3y210；···························13分y4或3或1．x251ABBC，ABCDC∴ABD···················································1分∴，ADB∵，∴，1．A∴BEDACB30··············2．分2C(D)B∵D，∴BDF∴FDE，．FEF在∴，∴FED∴，B，F(xiàn)在∴B，E，F(xiàn)···················································3分FDE，∴FBDBED，··················································4分．································································5分∴2B作BNAD交G，F(xiàn)作M，·············································1分∴GNCFMC．·················································2分∵ABBC，ABCDC∴ABDA∴，NG12∴，ANND，NDAD()CDBM1ABGDBGABC30．2FEF在12∴．DEDM∵，∴NDMD，·······························3分∵GDNFDM∴≌MFD∴GDFD．∵，∴BGBF且BDF，∴DBGDBF，··················································4分∴2．································································5分GDGDF，BGAG．···············1分∵DFBCD，∴BDF∴BGBF，DBG，AG∴DBF．(D)B又，ADGEDF，F(xiàn)∴≌EDF（E∴AGEF．································2分F在CE點(diǎn)DC∴，∴DFAG，································3分∵ABBC，∴≌DBF∴ABG∴ABG∴DBFDBF，12DBGABC30，，······························································4分∴，BG∴2DG2．································································5分21）中的結(jié)論仍然成立．·······························································6分GDGDF，．············7分BGAG∵DFBCD，A∴BDF，GD∴，BGBF∴DBFDBG．又，ADGEDF，BCFE∴≌EDF······8分∴AGEF．F在CE∴FCFE，∴AGCF．·····························9分又ABBC，∴≌），········分∴ABGCBF，∴ABGGBD．·····················································