2020-2021學年天津市濱海新區(qū)八年級(下)期末數(shù)學試卷

學年天津市濱海區(qū)八年級（）期末數(shù)試卷一選題共12小題，小分共36分）

A

B

Cx

DxA

B

C

DA35B234

D13A

BC

DABCD30CA

B60

C30

DxA2.54

B3

C2.5

D128+1A4215B815Cx2eq\o\ac(△,Rt)ABCBAC90ABBCABIH25ACFG的144BDEC

ABCDxx0AC

BD10ABCD的ADEAEBA10

B15

C20

D11yAB1CD25mmin124FBCAD

AAEBABE2DAF二填題本題6小題每題3分共18分）13x30xk14y1516x+417ABCDBDEFCDF4AE18OPOBMOAOBPMNPMN三解題本題7小題共66分解應出字說、算驟推過）191

2

201x52x221ABCDACMOBANAN22ABCDCDAE12ACOMOAFMAEMF23AAxy

/

/

AB

x

12yx3A324①OABCO0

Cm0m0Dm1BCAD1m2mm25OAxy3BCPCPPDxDyECPDAPB①12x20PyGMNN②xFAEPE

參考答案一選題本題小題每題，36分在每題出四選中，有一是合目求）

A

B

Cx

DxxA

B

C

D

2

4AB

DA35B234

DD13A32

B2+32

C1+2

2

D

+12

13

A

BC

DyxyxAxAABCD30CA

B60

C30

DABCDACA30C30CxA2.54

B3

C2.5

D1Ax2.5yx12.5yxBx3253yx1C2.5y24

4y2Dx1x1112C28+1A4215x8+10x8

B815Cx2

3D84x

8+16x2eq\o\ac(△,Rt)ABCBAC90ABBCABIH25ACFG的144BDECABCDeq\o\ac(△,Rt)ABC2+BC2ABIH25ACFG

AC2

AB+

25+144BDECCx28x0AC

BD

8cb2

82420010ABCD的ADEAEBA10

B15

C20

DAB+601801501511yAB1CD25mminA2.5kmB1kmC65minDmin

D

mD124FBCADAAEBABE2AxBCxEFCAxeq\o\ac(△,Rt)AB2BE2

DAF42+x

8x385AEFCEFBCAFABeq\o\ac(△,Rt)eq\o\ac(△,Rt)eq\o\ac(△,Rt)ABEeq\o\ac(△,Rt)CEEHHEH

BE3FHAFAH53eq\o\ac(△,Rt)EF

CDAEFDD二填題本題6小題每題3分共18分）13x30xk2

x1x

+2

k3k214y05xyy6x+5y050515ch

2

32

2

c4c16

2xx

xx22+223317ABCDBDEFCDF4AE490ABECBEABBCABECBECBEBCCDCFE90CFEEFCGFGAE18OPOBMOAOBPMNPMN

PPBJPKKJNPMPNOB

JPOAKOBOAPMPNPBJKKJOBMPMPN三解題本題7小題共66分解應出字說、算驟推過）19121342212620

22

2

121212121x52x

21xx0xx0x5x5x12x

23+10xx0x121ABCDACMOBANANODOBMNODOMCOMCOM22ABCDCDAE12ACOMOAFMAEMF

ABCDADDeq\o\ac(△,Rt)eq\o\ac(△,Rt)eq\o\ac(△,Rt)ADFeq\o\ac(△,Rt)ABEDF2AEMFABCDBCADCACOFOEOFOMAEMFAFAEMF23AAxy

/

/

AB

x

10012yx3A31AB

x100x

/

/

xx15100x2x+15xx+1500y5+15003

25x50y5+150050yx25yA24①OABCO0Cm0m0Dm1BCAD

1m2mm1mB4BD3BAD45DAEBAD45EyBDABDEOE102xOA90DEBD1OCExeq\o\ac(△,Rt)CDE

2

OEm2

eq\o\ac(△,Rt)AOE+OE42+m

2

m

m3

25OAxy3BCPCPPDxDyECPDAPB①1

yx+32x20PyGMNN②xFAEPE1APDPAD45OABP2BPOA12

APkxbyx+3yx+32