2020-2021學(xué)年四川省成都市郊區(qū)新城教研聯(lián)盟八年級(下)期末數(shù)學(xué)試卷

22222222222222學(xué)年四川省都市郊區(qū)新教研聯(lián)盟八級（下）末數(shù)學(xué)試卷一選題本題10個(gè)小，小3，30分每題有個(gè)項(xiàng)其只一是符題目求答涂答卡）A

BC

Dy40A7B1CDA3yBxyCx2yD+1+1A3Cab+1+A1B

B4+2D2hrr0CDACB90AB10DEACABEDEA3B5eq\o\ac(△,Rt)ABC90C48BBA

22222222A64

B

C21

D16bcmabAaCb2

Bb+4abD4a+4Amn0BCDACBDOMDCABCD24OMA12B3二填題本題個(gè)小題每題4分共分，案在題上11

ymxnx+3

311111311111111BDOANBD3三解題本題個(gè)小題共5分答應(yīng)出字明證過程演步）1mnm2

x2BC'ABCABCA1A和A'B'CC'ABCEEFF2O90eq\o\ac(△,A)eq\o\ac(△,)CCeq\o\ac(△,A)eq\o\ac(△,)BC3AB

ABCDMADMMNBDCDN1MNDO2ABCDABMNDO43212/30/①②9000

2212222122一填題本題個(gè)小題每題4分共分，案在題上yx

++ABll86x

xmymeq\o\ac(△,Rt)ACB90

CBAPDACBCC重DPE45ABCDEOAOB6x+80PyPA90PQBQP

222222222222222222222二解題本題小題，30分，解過寫答卡）ABAAB21A2B60316337n154196110k+1k2+1k+1kk+1++1+14kk+14+3k24+2k32021C

CBEODDO

COCOCOFDF1452OBF32MMOO'FM

232212232212學(xué)年四川省都市郊區(qū)新教研聯(lián)盟八級（下）末數(shù)學(xué)試卷參考答案一選題本題10個(gè)小，小3，30分每題有個(gè)項(xiàng)其只一是符題目求答涂答卡）D2C3D6AC9D10D二填題本題個(gè)小題每題4分共分，案在題上113bmx

三解題本題個(gè)小題共5分答應(yīng)出字明證過程演步）1mnm2mmm2

①x1②xx416+4xx2xxxx

111111111111111xxxx2xx

x2

x2BC'ABCABCA1A和A'B'CC'ABCEEFFb2O90eq\o\ac(△,A)eq\o\ac(△,)CCeq\o\ac(△,A)eq\o\ac(△,)BC33AB

11111F2eq\o\ac(△,A)eq\o\ac(△,)BCB35345y+b

yx

x+

ABCDMADMMNBDCDN1MNDO2ABCDABMNDOABCDOAMADOMACDOMCDOM//DNBDMNDO21MNDOMNDOOMODOM

CD

OD

BD，BDMNDOMNDOMOD90MOD

21212222121222MNDOMNDOOMODMOD9043212/30/①②90001+432x20%x20%2①900m/30m3900m25m4②aa/a30a900029a029﹣40一填題本題個(gè)小題每題4分共分，案在題上4382

1

22二解題本題小題，30分，解過寫答卡）ABAAB21A2B60xx12x12xB15260y12a40+15270+45000270yaa60a27060316337n

222222222222222222222222222222222222222221541961103k+1k2+1k+1kk+1++1+14kk+14+3k24+2k32021

2

7

68

7

5

3162k+24kmk+k+nn+nn4n+m2k+24+23434nkn1+3k13520213k2

k675

kk6756756741+67332021674m2697C

CBEODDOCOCOCOFDF1452OBF32MMOO'FMOB

4

DOB

222222222222OBF'BOB'BBCeq\o\ac(△,)'CCOOBPCBO'OBFBP2

'+

'+'OBC45eq\o\ac(△,Rt)BODOBOD4

BD8OEOE'BOB4

EO'EOBDOEDO'B8OE'ExDE4

xeq\o\ac(△,Rt)DOEDOODE84

x4

xx8404y+B

0084

y

x+8

3'O'G