2020-2021学年四川省成都市金牛区八年级(下)期末数学试卷

2222222222学年四省成都市牛区八年（下）期数学试卷一选题本题10个题，小分共30分在每题出四个项，有项符题目求.A

B3CDxABCDA1+1B+yxxyyCa+2Dx+2+2A180

B360

C540

DA52BA4

B4

C

D0

xy

AC

BDABCDA130

B100

C80

D50BDABCDDEECD1DABA

B

C2ABCD10BDA80B60CD30900AAC

BD二填题每4分，分分，将案在题上11abab

x

+

3ABCDCD3BBCPPQMBMADDEABCD

111221112212三解题本题小题，54分.解答应出字明证过或算骤）

2

+

14+

x101ABCAC290eq\o\ac(△,A)eq\o\ac(△,)BCCA3CABCDBDABOEOE

ADT25000TT

/

a10812TT1ABCDABEADCEO1DO2ADCGBCE60GFFGBGF33OAOBGFGFCEOF一填题本题个题每题4分共20分)+xn

x5

4ABCDAD3AD+

DP45ABC15BAAGBCDBD

AG二解题本题个题共分)20213146012003300BEDFDFADH1ABBHDH2AB

1222APD11222APD1如3ABDEGH若△CGH形求

ly+2llxD01l22CDAPS2xM△△yN

+

3lFD

学年四省成都市牛区八年（下）期数学试卷参考答案一选题本题10个题，小分共30分在每题出四个项，有项符题目求.3A5DCDA二填题每4分，分分，将案在题上113ab1216三解题本题小题，54分.解答应出字明证过或算骤）

2

+

1①x24x1②2x+13x4x4x42232x1x0x4+

xx

+

111221111221211212101ABCAC290eq\o\ac(△,A)eq\o\ac(△,)BCCA3Ceq\o\ac(△,A)eq\o\ac(△,)C2eq\o\ac(△,A)eq\o\ac(△,)3C

ABCDBDAB

OEOE

ADABCDBDDEADEDAE+ABDADE+BDEBDEDEABOE

T25000TT

a10

/12TT2aaa60

T

2T

8

2x2T1ABCDABEADCEO1DO2ADCGBCE60GFFGBGF33OAOBGFGFCEOFABCACBACADBCCEBACACBOCAOCBOAeq\o\ac(△,Rt)90OCD2OAOD2ADBDCD

BGGBCFCGBCG

BCF15FGCBGC150FGCCGFCGFGB3OG+OBOFOMOGGMCBCEOAOBOABOBAAOBBOMOMOG

OMGGMGOOMMGO60MGOGMFGMFGMFGOBGMFASAOBOAOFOM+MFOF+一填题本题个题每题4分共20分)22x525二解题本题个题共分)202131460123300x

2a15aaa16186

BEDFDFADH1ABBHDH2AB

如3ABDEGH若△CGH形求

ABCDBEDFADEAHBEHDEDHAASBHDH2BEDFADBCBEDFBHDGBHDHBHDGBGDG

222222△DHG122222222△DHG122ABCDxBC2xDGCDGCDG+xDG，DG

xxCH

x3GHCGCHDCH30CH2HDHDaCDDG

a

DH

DGDE

ly+2llxD0

2APD1122APDAPD2APD1122APDAPD1l22CDAPS2xM△△yN

+

3lFDCm3lyx：+23C13ly+C130ly3+62

3eq\o\ac(△,S)eq\o\ac(△,)△△△C130232PMNkxbP

kbbykx+

ky+k+2k+2k+20

OM

+

+

+

+

121121211223①D