2222222222學(xué)年四省成都市牛區(qū)八年（下）期數(shù)學(xué)試卷一選題本題10個(gè)題，小分共30分在每題出四個(gè)項(xiàng)，有項(xiàng)符題目求.A

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

B360

C540

DA52BA4

B4

C

D0

xy

AC

BDABCDA130

B100

C80

D50BDABCDDEECD1DABA

B

C2ABCD10BDA80B60CD30900AAC

BD二填題每4分，分分，將案在題上11abab

x

+

3ABCDCD3BBCPPQMBMADDEABCD

111221112212三解題本題小題，54分.解答應(yīng)出字明證過或算驟）

2

+

14+

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

ADT25000TT

/

a10812TT1ABCDABEADCEO1DO2ADCGBCE60GFFGBGF33OAOBGFGFCEOF一填題本題個(gè)題每題4分共20分)+xn

x5

4ABCDAD3AD+

DP45ABC15BAAGBCDBD

AG二解題本題個(gè)題共分)20213146012003300BEDFDFADH1ABBHDH2AB

1222APD11222APD1如3ABDEGH若△CGH形求

ly+2llxD01l22CDAPS2xM△△yN

+

3lFD

學(xué)年四省成都市牛區(qū)八年（下）期數(shù)學(xué)試卷參考答案一選題本題10個(gè)題，小分共30分在每題出四個(gè)項(xiàng)，有項(xiàng)符題目求.3A5DCDA二填題每4分，分分，將案在題上113ab1216三解題本題小題，54分.解答應(yīng)出字明證過或算驟）

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+一填題本題個(gè)題每題4分共20分)22x525二解題本題個(gè)題共分)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