江苏省沛县1617学年下学期八年级期中考试数学试题扫描版附答案.docx
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江苏省沛县1617学年下学期八年级期中考试数学试题扫描版附答案
2016~2017学年度第二学期期中考试
八年级数学试题参考答案及评分标准
一、选择题(本大题共8小题,每小题3分,共24分)
题号
1
2
3
4
5
6
7
8
选项
A
C
D
D
A
B
D
C
二、填空题(本大题共10小题,每小题3分,共30分.)
9.0.110.411.512.5013.30
14.7515.416.6517.3018.4.8
19.
(1)
···············2分
·················4分
················6分
(2)
················2分
·································4分
·················6分
···········8分
20.
(1)0.3;0.7·····························4分
(2)
·····························7分
答:
口袋中红球约有70只.·····························8分
21.
(1)△AB1C1如图所示;··························2分
(2)如图所示A(0,1),C(﹣3,1)·············6分
(3)△A2B2C2如图所示B2(3,﹣5),C2(3,﹣1).·······10分
22.
(1)50;36.··················4分
(2)如图所示:
···················6分
(3)600×
=60(名).···················9分
答:
估计这次模拟考试有60名学生的生物成绩等级为D.····10分
23.
·································2分
·································4分
·································8分
································10分
24.证明:
(1)∵AF∥BC
∴∠AFC=∠DCF,∠FAD=∠CDA,
∵E是AD的中点
∴AE=DE
∴△AEF≌△DEC·····················2分
∴AF=DC······················3分
又∵AF=BD
∴DC=BD
即D是BC的中点.·····················5分
(2)四边形AFBD是矩形.
∵AF∥BC,D是BC边上一点
∴AF∥BD
又∵AF=BD
∴四边形AFBD是平行四边形.·······························7分
∵AB=AC,D是BC的中点
∴AD⊥BC·······························8分
∴∠ADB=90°
∴□AFBD是矩形.································10分
25.
(1)∵CE是∠ACB的平分线,∴∠ACE=∠BCE·················1分
∵MN∥BC,∴∠FEC=∠BCE·················2分
∴∠ACE=∠FEC
∴OE=OC·················4分
同理可证:
OF=OC∴OE=OF················5分
(2)当点O运动到AC中点时,四边形AECF是矩形·················6分
∵OA=OC,OE=OF
∴四边形AECF平行四边形···············7分
∵OE=OC∴OA=OC=OE=OF∴AC=EF
∴□AECF是矩形·················8分
(3)∠ACB=90°·················10分
26
(1)B(12,0)C(0,6)A(6,3)·················3分
(2)设D
∵△COD的面积是12,∴
解得
∴D(4,2)·········6分
设直线
的函数表达式是
,把C(0,6),D(4,2)代入,得
解得
∴
·················8分
(3)点Q的坐标是(6,6)或(-3,3)或
·················14分
(以上各题如有另解,请参照本评分意见给分)