中考数学模拟试题及答案解析

精品中考数学模拟试题及答案解析(2)第I卷〔选择题〕〕12122〕33aaa6abab2232a6aa2a62a〕〕4和4和5和5和〕-可编辑-精品AOCAOBOOAOBEF、、〕FOEFEFEOEEEFxy5〕-可编辑-精品20x30y11010x5y8520x10y11030x5y85{{{20x5y11030x10y855x20y11010x30y85{nn〕株株株株223〕yxmxx223xmxyxmyx＜随ABCDABBCECDADE＜，为EDCAFEMEAFBCMAMBD点作⊥交、NAMADMCAMDEBMDEADCMABM=•N①=+=+2〕-可编辑-精品1个2个3个4个第II卷〔非选择题〕ABOOCABDODC弦、、ABADCDOBBOCADCABCABACDABAD-可编辑-精品EACAEABC、、ADEAOBOBx与是POAPMPNPNOBMON是AOB+ABCCABA、、、CBACCykmth〔〔hhkm；25hkmC27-可编辑-精品201702．322133x2xx.1x1OxA沿2，kx32Ay作．yAB=P〔x，y〔x，yxxyy，11221212PQ、AC图21HAGBDDCH〔、、BGBGHGCHAHCH为⊥，⊥-可编辑-精品xAxBxC5xDxExCEED8组6ABCAB=在CACBCOAB与AOBC相DE．-可编辑-精品ADBAC；CDxx1xyyxx求与-可编辑-精品1AFCDEAF交MMDE是BDAFH交MDE是ABEADEF、N的kkk=〔2yaxa=﹣yax2bxcc为ay-可编辑-精品233433x23BAByx2xC．AB；MCBACMAMC的以NAMNNEF，ACEFEF、、、、-可编辑-精品a3aabb+22a6a-可编辑-精品AD到BAOCAOBOOAOBEFEEF、、20x10y110xy{30x5y85选-可编辑-精品nnx22c故AxB2a随xDECDDECEDECFAEDFEC，为=ADEFCEADCFAEFEMEAFMEAFAMMFMCCF+，=，=⊥==AMMCAD∴=+ABBCABCDDEEC==么BMaABBF当=AMFMaABM+〕BMaaa=222AMDEBMAMABBCAMDEBM＜=++-可编辑-精品MEFFECMFECCMCFECDEADCFDEADCM=•2∵⊥，⊥×∵=，==2ABMAMABMBMAD＜BMAD∥NAMABMN2．7．77OAOCAB⊥ACBCAOCCOBADC∠=1AOC2-可编辑-精品5或．53当时，∵∠A=∠A，∴△AED∽△ABC，·62此时AE=；55当时，∵∠A=∠A，∴△ADE∽△ABC，·525此时AE=；635或.5333，22NOANNMOAPPMPN′交于+OANNONON′=NONAONNONMONNMON′⊥NONMONOM是点是33333PM=〔，P，22222-可编辑-精品PtCAB、Chhkm，km5757h〔2h2kmC-可编辑-精品xxxxxx﹣=223yPQxBPQ33kxBB把入y223y．xPQkyyxPxyxQxy限随〔，〔，11221xyyPQPQ＜＞、212-可编辑-精品BEDH⊥GHBEBGEH=、=AHxBEGHx==，CHAHCAH知xCECHEHxBEDEx由==﹣=BEDHEGHBEBGEH=、=AHx=⊥BEGHGAAHxACHCHAHCAHCECH=﹣x==+=EHxDBEBEDECEDCxx==+xCHxCH2．3AABBCCE-可编辑-精品EBC6E882=．31．4-可编辑-精品DEOD，DAOCADBBACBCODODB2ODBD=BODBDxODOAxOB=，===2BDOD==DEOD．，BCODCDAAEDAEADEACD⊥ACBCDAOCADADBAC；ABC=CACBCBBACBCOD2ODOAxOB=，=∠ODBODBD=BODBDx==x222BCACxACBCABxxxxBDOD====+=+〕=，2222224521BOD﹣S=22=1．DOE2360417.7x352(1x9){y3x260x80(9x15)-可编辑-精品xxxaxxxx2xy1xxxyxxy3随y大xyxxx当32xxxxyx随22xyxxyy当随大17.7x352(1x9)yxx{与，y3x260x80(9x15)第aa〕-可编辑-精品aa2x2k22．2k2ABCDABCD，∥=ABEFABEF=，∥CDEFCDEFCDMFEM=，∥，CDMFEMDMEM=；DHBH=AFBE∥DMEM；CDMFEMCMFMADaCMb=，=FMbEFABa=，===ABCDAC=2a=+ANFNFa2NENFEF+22abbaa2〔3〕由于==22==kabk22abaa2=21=abbk2ABCDABCDABCD=，∥ABEFABEFABEFCDEFCDEFCDMFEMCDM=，∥=，∥∠-可编辑-精品FEMCMDFMECDMFEMCDEF=，CDMFEMDMEM=，MDE是=ABCDDHBHABEFAFBE∥HMBE∥DMEMM是DECDMFEMCMFMADaCMABEBAF=，=ABCDNAFABCDAC=2AD2a=22ABEFAFNBAFANFNFAF=abb∥=〔2++〕222ab2aba2bNENFEFa2baa2b=+=+++=+=ab2ab222=；22abbb1a2==22=a22==kaabk22aba22kk=211=．=2k2ab2233233yx23N233332433233433EFEF，2-可编辑-精品10334，AB、NyAADyDANACA作⊥=ONNMyMNNPx作⊥NMPNMPMPNPP和N得ACFFHAAKxK作⊥，EFHACKDFFFHEEACEtAC、ACFABtEF、233433233233x223xyxy，233233yxx2{{y2323433yx2x233x12332323By或{A23xy03NyAMNAADyD在作⊥-可编辑-精品233433ADyx2x23或2A23AC=23且223=13ANAC=13，在ANDDN=ANAD=134OD=23ON=2223或ON=23ON=23MNODCMMNCMN23MyMONNPxPAMDAMC=当与作⊥ADOD23DAM3DAM∥ADx===DAONMAAMCNMPMNCMMP==12333323332MNNP=MN=N=，，2223332N23，2ACFFHAAKx⊥轴作KACEFACEFACKEFHACKEFHACKEFH∥且=∠，AKCEHFACEFACKEFHFHCKHEAK23∠，===