2020-2021学年陕西师大附中八年级(下)期中数学试卷

学年陕西师大附八年级（下期中数学卷一选题共12小题）A20

B120

C20120

D36A34B32CD28ABCDBCECECDA15

B20

C30

D40eq\o\ac(△,Rt)ABC90EDACACDBCECA30A1

B40B2

C50C3

D60D3m1A

B

1212C

DA1

B2

C3

DkxP1x+mkx1A1B11DxABCAA2

B2

C2

D210ABCDEFOA

B90

C45

D6011ABCCAB65ABCAeq\o\ac(△,AB)eq\o\ac(△,)C

A25

B30

C50

D55124A2

B3

C4

D二填题共4小）13ABBDACDCBD14ABC50ADDABCADECAEC

152xbx016

x+4xAOBeq\o\ac(△,)

三解题本题7小题共52分17x6+131850021yx219PAP2D12APP20DABADBFADDF1平BC2BFDAD21eq\o\ac(△,Rt)ABC90ADCABAB68

CD1DE222eq\o\ac(△,Rt)90DBDABEBD130AEDAF23PCHAPBCEACF1CBF2BF3AEBFGS

参考答案一选题共12小题）A20

B120

C20120

D36xxxx204xx++x420CA34B32CD28903cmCABCDBCECECDA15

B20

C30

D40DACBCBD

CDEEE30Ceq\o\ac(△,Rt)ABC90EDACACDBCECA30

B40

C50

D60CEEACAEBEACCC40A1

B2

C3

D35x33m1

121121ACP3mmm1m3m

BD

A1

B2

C3

Dx32x1kxP1x+mkx1A1B11Dxxyxkx1ABCA

A2

B2

C2

D241ABC2A210ABCDEFOA

B90

C45

D60ABCDEF

60ABCDEFOD11ABCCAB65ABCAeq\o\ac(△,AB)eq\o\ac(△,)CA25

B30

C50

D55ABCAB

eq\o\ac(△,)CACACC1805050C124A2

B3

C4

D4C二填题本题4小题每题3分共12分）13ABBDACDCBD

AABCACB

BDD90721814ABC50ADDABCADECAEC115BCDBEDCEEBCAEC+EDC+25AEC15x+b35xx+b0y2+3553+bb12+b0xxx16

x+4xAOBeq\o\ac(△,)7

yx+4xA0BOAO90BOOAAOBOA+OB+B7373三解题本题7小题共52分17x6+1356+1x356+1x1x36a1850021yx21yx22y+500xxy+500xx500

y+500xx50050050050019PAP2D12APP1D22Aeq\o\ac(△,)DPAP2

APP20DABADBFADDF1平BC2BFDAD

ADADACE90BC+ACDBeq\o\ac(△,Rt)ACEDBFeq\o\ac(△,Rt)DBFFBEF2ADBFACE90ACDBeq\o\ac(△,Rt)ACEDBFeq\o\ac(△,Rt)DBFFB

EF21eq\o\ac(△,Rt)ABC90ADCABAB68CD1DE21ADCABDE90CDDECD3DE2eq\o\ac(△,Rt)ABeq\o\ac(△,S)ADB1022eq\o\ac(△,Rt)90DBDABEBD130AEDAF1AEEBDGDE

B30D30DEADBeq\o\ac(△,Rt)ABCACBA60ADEAAEFEF2AFDACBFCDAAFEAAF23PCHAPBCEACF1CBF2BF3AEBFGS