陕西省西安市末央区2019年中考数学一模试卷

2019年陕西西安市末区中考数学模试卷一选题共小题满30分每题分A3B3

DA

BC

DA

BC

DPmmmAmm2C12DA2014B1xC3xD1xABABCDAC+AECA

B

C

D12

32132102121c321321021212bc+d2102+1+0+1255A

BC

DOBAC

A

B

C

Deq\o\ac(△,Rt)ABCCAB6cosA

B

C

D3y2yy++PymA3m2B

C

D2二填题共4小题，分分，每题3分1

62.1662.16

222222yAABx

eq\o\ac(△,S)

AOBABCD2AEDFAF三解题共小题满78分

+|1

+

+xyxy+xzx2yx+z

ABCABBC12OA

123ABCD和ECAEFADDBDDE1cos750.259tan751.4141BAxy

1yx2ABBBCC

BD12ABOCDECDPOGAGCDA20AGPEOADGAB2x+112

PFeq\o\ac(△,Rt)ABCBBDDAD1CAB2BC3ECAEBD3BC

年陕西西市央中数一试参考答案试题解析一选题共小题满30分每题分AABCDDABCDBm+1m2++

211112222333333444y211112222333333444k0A2014B11.7310.730C3DBk00yx6CDDCEBAE+CAE2ABAB1BAEAE+3ABBOEBAEBOE+AE4AB+C+DCE360AE36056ECDD

32103321032103213210A0+02+1+0210B+122C22D12+1+122B60OBC2OB2A8eq\o\ac(△,Rt)ABCC10BC

212121212212121212AC

A

AyByaxbx+mnym

x3yyybx+yym

二填题共4小题，分分，每题3分

5

10.163696296060

yAAABB△

2AE1ACCFFACAFACAEEDDFEDFEDA+90ADCD90+CDF90CDFCDFCDFSASCF12

CF

1

1

1

222222222222222222222222222222三解题共小题满78分3+

+35xy+zyzyxyzxyz+x+x＝y+2+2yx+2yzy+x+yx+z+zxzx20yz++xyzyzxy++2y+2+++yzzx+2y02xy+2xy2xzxy++0xyzxyz12OAACDOD

2222222222DOCABACBCBDCDeq\o\ac(△,Rt)ADC

OARODReq\o\ac(△,Rt)OD+RR+8

OA231220%6015%210%12

6

2

100%21

21.82%2

100%13ABADBDECFCDFSASABEADFAEABCDBCDCDFCDFABEADFABEADFSAS

eq\o\ac(△,R)ABC208eq\o\ac(△,Rt)DFBCEF90EFBCeq\o\ac(△,Rt)ABC90cos800.259eq\o\ac(△,Rt)BDFBFDsin

DFBDsin45800

4001.414DEDF+772.8773A1200y2BmnnB121200y2Axyx

xxyA40AxBCcx+20+8yB

cyccAxyxc150xcxyc302A216eq\o\ac(△,Rt)AEF20GFPEFAOAPGOGP9020

ODADAGDDGBAGAGD30eq\o\ac(△,Rt)AGBAGeq\o\ac(△,Rt)AEFAFGFPFG64CDABAA9020OAOGOGA20PGGOGP90AGPOGPOGA20BGODADCDABODOADAODAGD30DGABBAGAGDO

AGB

AG6OGOAOGA30PGG903060GFP

22222222240y+mxn21y+3y32x+2xx+1﹣4x1142ACBDF3AE

1DBCDB90eq\o\ac(△,Rt)ABC+ABC90DBCCAB2BDECeq\o\ac(△,Rt)ABC3ABAFBBFCeq\o\ac(△,Rt)BFCBCCFAC9BD

ACBC5CG43CGeq\o\ac(△,Rt)ACGAG

DB1CABDBA90

EGAEBCDO90CDBCAD90

eq\o\ac(△,Rt)ABDBDBD

222EOCE222ADCBDCDCCCMBDCNADCHABMNHeq\o\ac(△,Rt)ACBAB5BC2eq\o\ac(△,Rt)ACBCHCH5CH2

MBADBeq\o\a