2020-2021学年北京市朝阳区日坛中学、日坛实验学校八年级(上)期中数学试卷

学年北市朝阳区坛中学、坛实验学八年级第一学期期中学试卷一选题共10小题）2420220220A

BC

DA14B8645D3A3aaBa

C3a6a9

D22a4xOyPA2

B21

C21

D2A12B23C14+5D2ABCDEFADFDEF

AABBACDFCBEDABCBCADDC40CA25

B35

C40

D501CA7B8CD10ABCEFBC+PCA3B4CD610

A

B

C

D二填题共8小）11aa1213

x

axyCD15ABCDBDCADBCABEADB16ABC17ABCACDACBC

1832

272

8

12152222三解题共46分19

2021BCBFACDFDFED221xyxy2xy+yxy23x+2xxx224BD1BCBDF2CFAABD25ACF

25261a212a2b232x5xy3xy4271ADDC1MONOCMONMONOAMON222ABAD

3

参考答案一选题共10小题）2404202202

A

BCABCDD

DA14B8645D3A3B8C6+512D3+36A3aaBa

C3

a6

a9

D22

2Aa2

a2B3a6B

11Ca3

a6

aCD22

44CxOyPA2

B21

C21

D2221A12B23C14+5D2A11B2AOD2C114+5D2OBC2CABCDEFADFDEF

AABBACDFCBEDACDFDEFABCABCBCADDC40CA25

B35

C40

D50ADBADBBAD40BADCDACC35

ADB1CA7B8CD10

ABABC3CABCEFBC+PCA3B4CD6BCCEFABPAB4PC4

10A

B

C

D4C二填题本共24，小分11aaa3bab3a15a3

15a

126060613

x

axy15aay3a

x+y

y51515CD

15ABCDBDCADBCABEADB30ABCDABCCBECBDCBD，ADBCBD3016ABC7545ACB60ABC45757517ABCACDACBC

MNABDADBCD++DA+14141832

272

8

12152222725872385852

322

8

352

872

3282525三解题本共46）答写文说、演步或明程19

xx+2x12x3.513202x

x1x1①，5+yy221BCBFACDFDFEDBF+FC+CFBCEFDFEACBSASA221x

y

2xy2xy+yxy1xyxy2xy2xy+yxy92

xy2

+3xyy292xy23x+2xxx2x

xx24x

x+6x2+45+10

x252+1010+10024BD1BCBDF2CFAABD25ACF1EF2BDABCABCABDABDABD25ABCCBDA60ACB5070FCCBFFCBACF702545

25DEFABDEBCEFAMABCDEFAMDNABCAMDNDEFBMENABMDENABMBEDEFABCSAS261a21a22+b2ab+b

ab32x5xy3xy

43a+b3abaab+b2

1a242+ba

2

a12ab2

a2

4aba2

b31x+224x5xy352

xy2

4xy13134+3+a2

+2ab3ba2ab+b2a3+a+b2271ADDC1MONOCMONMONOAM