2020-2021学年福建省莆田市八年级(下)期末数学试卷

学年福建省莆田八年级（下期末数学卷一选题共10小题，题4分共40分）A

B

C

DA

+

B2+

2

DA150CA30

B75

C

DA

Bx10DxA

BC

DABCDABACEF4A483216D0A

B

C

D

A

BC

DABC①a2

c+b2

②C③c

④CAA1

B2

C3

D10AC

BD二填题本共6小题每题4分共24分11eq\o\ac(△,Rt)90DAB12A1mnym131409040%60%

15ACBDO

BO16OABCACxAC6A三解题本共9小题共86分解应出字明证过或算骤17

2

18ABCDEFBDDFAECFAECF19yxxy21y22x20eq\o\ac(△,Rt)ABCABC901ACDED2AB12CBAD的

2170090808080100708090100

1b23221Qt

1a

2

3Q

t

23EBEABAD12CD242021601100366035105012251ABC9030DCCAAAAB1BD1DF2EF12

DFBCF

①tAEFD

②DEt

参考答案一选题本共10小题每题4分共40分每题出四选中只一项符要的请出在题上该涂A

B

C

D2BC

D3DA

+

B2+

2

DA

ABC3

B3DDDA150C

A30

B75

C

DABCDACD

ABx10Cx0x10

Dx10

A

BC

DAABBCDDCABCDABACEF4A483216DEFABACBC28ABCDAD320A

B

C

D

A

BC

DADDABC①a2

c+b2

②C③c

④CAA1

B2

C3

D①a2+b2②BC90③④AC10

AC

BDD二填题本共6小题每题4分共24分11eq\o\ac(△,Rt)90DAB

eq\o\ac(△,Rt)ABCDABCD32212A1m2ny3xnk3y1mn13

14060%8060%8686

15ACBDO

BO

ABCDBDCOeq\o\ac(△,Rt)ABO

BO2+BO2AO2

16OABCACxAC6A

90AC3OA

OC

OD＝

AD

OD

三解题本共9小题共86分解应出字明证过或算骤17

2

21266

2

18ABCDEFBDDFAECFAECFBDOABCD

OAOCOBODDFOF19yxxy21y22x1yk25xyk42k2yxy22yx22x20eq\o\ac(△,Rt)ABCABC901ACDED2AB12CBAD的1

2DEDAADBD18eq\o\ac(△,Rt)ABDBD22AD218

+12

x

x13AD2170090808080100708090100

180852316

a60809090100b

858023700+700221Qt1a422

3Q

t

1t42a42422tQ5125305Qt

+

012Q6t+42023BEECEDAD12CD1ABCDABBECDADBCADDEDEBECD2CD2BEADABD90

最小最小BD

2420216011003660351050121

1502m60mww120m+15060mm3mm450m300mw30457650251ABC9030DCCAAAAB1BD

DFBCF

1DF2EF12①tAEFD②DEt

190DCtDFtDF2①①BCDFBCDFDFAEFD12ADACDC122AD12t