上海市浦东新区九年级(上)期中数学试卷

DB3DB3学年上海市浦东区九年级（）期中数试卷一选题每题4分，共24分）()AC

BD1()A40cm

Bcm

C0.4

D4DE//

AD2:()A25

B:

C:

D21ACDACB

ACBC

AC

ADABABCACD)A1B348()A

B

C910OABCCB(1,2)OOABD()

A

B

C

D

二填题每题4分，共48分）

x2yy

a)

DEF4:DEF10DEF

BP

11DE//DE:4:CE

AD//BECFABcmACDEcmEF

ADGGEF//BCACEACAF

ABCDDCDE::

RtCDDACBCBCD

420RtABCC90tan

34

DCBCDDB三解题共78分）602sin30ABCD/CDBDOCO

AC1

AB

aDCAC45DCDADBCDBACABDAE

ABCDAB//CDBCAD1E)AD

2ABECDEBCEAD2)AB//EAD1

DE2

SS:S32ABCRtABC30DBCDBDE点EACBCDFxCG1BD2x3DDEFB

DB3DB32018-2019学年海浦新九级上期数试参考答案试题解析一选题每题4分，共24分）()AC

BDACDB1(

)A40cm

Bcm

C0.4

D420

)

DDE//

AD2:()A25AD2AB

B:AD2DB3

C:

D21//BCABCSAD2))S25S

:S

AACDACB

ACBC

AC

ADABABCACD)A1

B2C3①②ADCACB③④C48()A

B

C91085

403

9COABCCB(1,2)OOABD()

A

B

C

D

DFDExEBDOCBCGODG

GOGBGO

)

54

GD

BCyDFGBGCDGF∽

DFDGBC

DOOF)cosD

OFOD

二填题每题4分，共48分）x2y5y3x2ykyx2k5y3ka)

b

abbDEF4:DEF10DEFABC3aaaDEFa:a:10x5cm5BPPAP5552211DE//DE:4:CE

//BC

DEAEBC:AEAC

AE3CE:CE3:1AD/BECFABcmACDEcmEF////CFABDEBCcmDE7EF

215

cmEF

ADGGEF//BCACEACAF

GAGDGEF//

AFDG2ACADABCDDCDE::

3:

DE:EC:ABCD//ABEF:AB:EC:3:2:FE22

RtCDDACBC

RtABCCDAB90BCDBCBCtanAC2

4

734①474

②45

74

734202.5//BC∽ABC

AFAFAGBCAF2.53RtABCC90tanDABABC4BCDDB

ACB90ABCD5DCAB2BCB12

34

三解题共78分）602sin30tan45

33233

ABCD/CDBDOCO

AC1

AB

BCbCO:CD//ABABOA

AC2ABACCBACAB

ABDC

2b3AC45DCDADBCDCDACDBDC90CD

AC

BDRtBCDtan

BD22BACABDAEBEBACAC

)

BAD45EABBAD45ADCEAB∽

ABACABAC

ABCDAB//CDBCAD1E)AD2ABECDEBCEADACD//ABDCACABADC

ACD

ABACCDAC2ADAC

2)

2ABEDECAEB180DECBECAEB60RtDECtanDECDEDE

RttanAEB

ABAE

3

3AB//EAD1∽

DE2

S:32ABCMD//MED

∽BCA2ACB90MBMCAMMCMD

AB

SMED∽BCAS1SAB4S34

:

33

34

MEMB4MDME4EMD

ME3DME

RtABC30DBCDBDE点EACBCDFxCG1BD2x3DDEFBE

RtABC9060EFABBEF9030DEG