2021年陜西省西安市碑林區(qū)西北工業(yè)大學(xué)附屬中學(xué)中考數(shù)學(xué)四模試卷

20202021年陜西西安市碑區(qū)西北工大中中考數(shù)四模試卷一選題共10小題，小分計(jì)30分，每題有個(gè)項(xiàng)符題的A1B0

DA

B

C

DA1BC9D

2CA

B

C

Dk4kA2B22DABCCABAC6ADA5B7CD0myxy+

21201202120120A．第一象限B第二限．象限D(zhuǎn)第四象限8）如圖，在菱形ABCD中AC、BD相于點(diǎn)O．點(diǎn)E在，且DE：EC＝12，連接BE交于F，BD＝6，CF則菱形ABCD的為（）A．4BC．D．59）如圖，O中∠AOB∠COD＝180°，＝6，OE⊥AB點(diǎn)EOE的長(zhǎng)為（）A．3B．3D．610分知拋物線+bx+c（a≠0有兩點(diǎn)A（，y﹣3P（3，y）為物線的頂點(diǎn)，滿(mǎn)足y≤y，則的取范（A．≤2B﹣2C．m或﹣2D或≤﹣2二填題共小題每題3分，計(jì)分）分若代數(shù)式

有意義，則實(shí)數(shù)的范圍為．12）一個(gè)多邊形的內(nèi)角是那么這個(gè)多邊形邊數(shù)是．13圖形的OA在x的正半軸上是原點(diǎn)∠AOC＝反比例函數(shù)的圖象經(jīng)過(guò)點(diǎn)C，于點(diǎn)Deq\o\ac(△,若)的為10，則的值等于．

14ABCDABBC8EFABCDADBCPEF三解題共11小題計(jì)分。答應(yīng)出程1516

x1790BCABPC18EDDEAC于123ADAC

212221122122211219Cxx軸ABCODEFOAOBDFC12PCOPOPQC20CDAEADGDFBGHAB

21B2B1B2BB10082BB2211

2323ABCBCABODDBCE1CDEABD2ABDC

2△2△24LyxCD1CD2Lmm0L''m251①ADSABCD2②ABCAD6ABC3③ABCDADDE3AB6ABCD

最大值；如果不存在，請(qǐng)說(shuō)明理．

20﹣220﹣220﹣220﹣22021年陜西西安市碑區(qū)西北工大中中考數(shù)四模試卷參考答案與試題解析一選題共10小題，小分計(jì)30分，每題有個(gè)項(xiàng)符題的A1B0

D0

1.732

11DA

B

C

D33CA1BC9D

2BC9D

△△CA

B

C

DBCDABCADBCD246ADADeq\o\ac(△,Rt)ABDC

2

2k4k

2222222222A2B22Dkkk0kyAkkk2ykxkk2ABCCABAC6ADA5B7CDBDADABBCDBDADAD8+x8+6xD

0myxy+A

B

C

D

n0n

y3m+ACECDECFCF4A4B

C

D由CEFAFBCFAF+FCAODADABCDBD6DCABODBDCABCDOOD3CEFFCAFDEEC12223FCAF3

FC46AFFC6+4OAeq\o\ac(△,Rt)AODADC

OAOB+CODOEA3B2CD6O+COD+180AOFCDAF6OEABOEBFABOEAF

21201200102021201200102021210OEAFOE

10y05ym3yP3yyymA22B2m14m2m2Dm143yyyy

+bx+P3yxA5y3yybxy5mmm82m14二填題共4小，每題分計(jì)12分）

x0x3x3x312144010n2nn1440101013OABCOA

AOCAOCyCD10k12ACEOCEOCECCEEABCDOCDOC10△△eq\o\ac(△,Rt)CEkkk

OAOCk

OEOE12abkabCE121214ABCDABBC8EFABCDADBCPEF16FMMMFABCDFCDP++EPEFEFEFBFEDMEADEF10PEFEF6PEFFMMBFMFABEEP+PFPFFPEFEF+ABCDEDMEAD6AD

10EFPEFPEF10+616三解題共11小題計(jì)分。答應(yīng)出程15分5x3x3x316原

x

2+

1790BCABPCCABBC18EDDEAC于123ADAC因12ECABCADEACBACDACDAE2+

212221122222212221122222BAC2++180+C2AFEECABCADE19Cxx軸ABCODEFOAOBDFC12PCOPOPQCDE2Pmm8QQmmm4x2x8x280x42yC2DFOA

22222222222222220Cya+1FaCy2x22Pmm8Q4xy8mm420CDAEADGDFBGHABDDMABMEHNEHCDBGADECDFAMDABMN

AEABABAMAEEHCDBGEHBHBMCD1.8ADECDFAM3.6AM+AB21B2B1B2BB10082BBAB

BxxAaB+3050aa0aa80A802bww80[8+1002]292B92B221150232

231050

1020250232033分121223ABCBCABODDBCE1CDEABD2ABDC

ODCDEODB2OD⊙OODEODB+ADB+BDC90+OBODOBDODBABD2CDEABDsinCDEsinABDeq\o\ac(△,Rt)ABDABAD10

22222222222222222222BDDCAD+DCxeq\o\ac(△,Rt)BDCBDC90BCBD+DCx

x

DC

24LyxCD1CD2Lmm0L''m0x22x3D2Lmm0yx1m﹣CxLPLxPCDLFyx1mxx4

222212212222222222122122222222222212yxyCDC0142Lm0Lx1mCPxLDPDECx2DEP9014590LLPP23yx43mm0LFFD.yxx0x3x13CF1+2+4CF+CDDF90FLL'P3CDP30yxm20mm0mm4

△△251①ADSABCD2②ABCAD6ABC3③ABCDADDE3AB6ABCD

S矩形2②ADDTADCT3③EJB