2020年江苏盐城中考数学试卷及答案

2020年江苏盐城中考数学试卷及答案一、选择题：本大题共8个小题，每小题3分，共24分.在每小题给出的四个选项中，只有一项是符合题目要求的.2020）1120202020．．．．）．．．．）2aa2252a6a．．．a3a2a6．a3aa2a）,ba0．ab．ab．D．ab4）．．．．年7400000400000）．0.4104940445．．．33699把1这①②x）．1．3．4．6ABCDACBDBCAC6,BD8OH,H为）552．．．3D．5二、填空题（每题3分，满分24分，将答案填在答题纸上）A//b,1602,bac．1,4,7,4,2．yx2．2x10x．x13.一只不进明的袋中装有231．BOC,则BAC在BCOA//DE,BCDE,ADBC4,ABDE10且BC．5A5,2,B4),C1)，mBC与lxM(m2k(kkABClABCyx．三、解答题（本大题共11小题，共102分.解答应写出文字说明、证明过程或演算步骤.）20423.332x13.4x53x23m12.mm29m33ABCC90,tanA,ABCBD交ACCD3AB的3OABCDEC;1EOEB2EBEC,CEO.BEO①②为B为A1①A为；2A14②A3①②图1③1,2④2图为22；3nn492n；O是ABCAB是ODCAB.1CD是O2若DEABE,DE交ACDCFMx,0,Nx,00xxxaxbxcy21212A0,2,Al与C,BAACNx5SAMNS,BMNS.S2122112l31AB200AD长为10030P②21303P②1~4.1在RtABCC90,22ACBC2.70.83.52.61.23.82.31.63.91.52.43.90.42.83.2224ACBC3.2BC2BC和AC①BCACBCy设(x,y)①②3xy4CRtMBCCa0BCABa(aBCAC5对42①345②,BBEFGA厘4AGBE1EG90,ABBNE60,FFMFNEF参考答案一、选择题12345678ABCCADAB二、填空题yxy12.1x602256或414.1302三、解答题8217.21x34x53x21x①34x53x②①x2,x7,②①、②2x7.3m12m.m9m3233mmm9m3m32mmm29m3mm3m3m3m1m32当m11233RtABCC90,tanA3A30,ABC60,BD是ABCCBDABD,又3在RtABCC,A6.1EOC2OB由1EBECOABCDOBOC,在EBO和ECO,BEOCEO.141,1323AB1③图4233；1OCOCOA,OCA,ABOBCA,AB90,DCA,又OCADCAOCD90,OC,又点COCD是O2OCADCA90,OCA,ADCA,DE,AEFA,DCAEFA,EFA,DCA,DCF又1上2①若，则C与OA点lBA)②若ANC90C在xC在x③若CAN90ACNANC,AOCONO2则C(0),N2,0:ykxbl将A0,2,C(2b02kbk1b2l:yx2.x3过BBHH,11S,S,22125S2又S21522,又OABH5,5,即B5yx2x3,将yB3,5N将Aaxbxcy2c2b24a9ab25a2bc22x5x2y.21P作PECD,EPcmPE,AB与AB,A'D'与AD,B'C与BC,A'B'C'D'2001515,B'C'A'D'1001515,702480cm.CA'BCD'cm.2PE,P作PQCDQPcmPEPGPF,PGFPQGF,cm,PQCQ,.EFGGDE'FG30,DE'G'与ADDP'D30至5.lppcmC3324600120320cm.120320cm.6003242ax,ACBCyBCC,ACABBC4ax,在RtABC2222yx4ax22yx4ax22y2xyx4ax,22222x2xyy4a0,222xb44y42x4a2222y28a,2ya0,y22a,当22ay2x42ax4a02222x2a0xx2a12当BC2ay,AC,ACBCy设BCC,在RtABCmna222mn2mn2mn.22当mn4a2mn,2mna.2ymnmn2mn224a2，2mn2a,2y22a,当BCAC2ayAM交EFC,EFGF,,A作AHB作BKHHK,K,BK交AH,BNE60,E90,BE1BNE1即333NEAM//BN,C,GFE90,又CMF,AMG,G,AGAMG，在RtAGM，313GM即GGFH,AHF,AGFHAH,GFHE90,BHF=90BKFEBKFE,，FNFMEFFGENGM3BKAH33433BQAQQHQK43BQAQ23RtABQ在AB4.AQBQ223433FN42222FM433221FMFN422EFEBGAH,3GM3,NE3设AHa,BHbGFEHGFEH,EFGH,MFEHGMb13.3FNEFNEa1343MFFNab23ab16,22b22ab3a433ab22FMFN时422433221FMFNEF422AGFHAH,GFHE90,BHF=90BKFEBKFE,，FNFMEFFGENGM3BKAH33433BQAQQHQK43BQAQ23RtABQ在AB4.AQBQ223433FN42222FM433221FMFN422