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2012年石室中学八年级上数学半期考试勾股定理与实数部分真题

??????????????2014??2012-2013??????????????????????????

A????100????

??????????????????3??????30????

1.??????????????????????????????????????????????????????

A B C

D

2.9??????????????????

A.3 B.??3 C.??3 D.3.????????????x??4????????????x????????????????????

A.x??0 B.x????4 C.x????4 D.x>4

4.??????????????????????????????????

A.1??2??3??4 B.3??2??2??3 C.1??2??1??2 D.1??2??3??2

5.??????????ABCD??????????????????????????ABCD??????????????????????1??AB//CDA B=CD (2)AB=CDA D//BC

(3)??A????B,??C????D (4)AB//CDA D//BC

A.1?? B.2?? C.3?? D.4??

6.????????????????????????????????????

A.?????????????? B.??????????????

C.?????????? D.??????????????????

7.????????????????96cm????????????????1:2??????????????????????????????

A.21cm B.22cm C.23cm D.24c.

8.??????????????????13????????10????????????????????

A.12 B.6012013 C. D.13135??

9.????????????ABCD??????????????????ABCD??????????B????

????CD????????E??????????AF????CD=6????BF????????

A.4 B.3 C.2 D.3??????????

12.????????????????x??2??3??y??0??????????xy??????_____

14

????????????????????????????

??????????

16.??????????????x

????????3x??1)2??27 ??????3x2??81??0125

17.??????210 ??????2--27????????--2??1??2-1-2

1-220110??????2??(2??)??2 ????-1????????-3????27??????2

????????????19????????20????????21??10????

18.??????????????????????ABCD ????????44cm????????????????AB??BC????????DE??DF????DE=53cm??DF=63cm

????????AB?????? ????????BF??????

??????50????

??????????????????????????20????

21.????????????????x-4??x+2????a=_________

23.????6-23??????????????????????????????????5+23??ab=_________

24.??????????????????????????????????????????????????????????????????????????????1,2,3????????????????????????????????S1??S2??S3??S4????S1??

S2??S3??S4=_________

25.????????ABC????????64??????????????????AB??AC??BC????????A/??B/??C/??????EF??EG??GF??????????A/B/C/????????_____;????????ABC????EFG????A/B/C/??????????????????????????3

????????????????????????????????????????????????????????????_______????????????27????????28????????29????????30??10????

26.

??a2??3a??1??b2??2b??1??0,??a2??1??a2