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江西省南昌市2012-2013学年七年级数学上学期期末终结性测试卷(B卷,扫描版) 北师大版

发布时间:2014-01-26 17:10:37  

江西省南昌市2012-2013学年七年级数学上学期期末终结性测试卷(B卷,

扫描版)

北师大版

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2012—2013学年度第一学期南昌市期末终结性测试卷

七年级(初一)数学参考答案及评分意见

一、选择题

二、填空题

9.3.14,3.1416 10. u+v,u-v 11. 20,1000 12.11或5,7或1

三、解下列一元一次方程

13.解:?8x?11

2x?3?4

3 ························· 1分

?55

2x?3 ··························· 3分

x??2

3 ·························· 4分

14.解:0.25x?1.35x?5.7?0.7 ······················ 2分

1.6x?6.4 ························ 3分

x?4 ························· 4分

15.解:15(3x?6)?14(2x?4)······················· 1分

45x?90?28x?56 ······················· 2分

17x?34 ·························· 3分

x?2 ·························· 4分

16.解:7(1?2x)?3(3x?17)?21 ····················· 1分

7?14x?9x?51?21 ······················· 2分

?23x?23 ··························· 3分

x??1 ··························· 4分 四、几何题

17.

··························· 每图2分,共8分

18.(1)量出?B、?C的大小 ·················· 每个1分,2分

(2)画出?B、?C的角平分线BE、CF ············ 每条1分,4分

(3)量出?BAD、?CAD的大小 ··············· 每个1分,6分

?BAD=?CAD ························· 8分 五、应用题

19.解:(1)第一行数的规律是:后面一个数是前一个数的-2倍;

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(2)第二行数比第一行数的对应位置大2,

第三行数是第一行数的对应位置的一半;

(3)设第一行的第n个数为x,则第二行的第n个数为(x?2),第三行的第n个数为1x,2

1x?642 2

解得:x?256 则x?(x?2)?

(?2)n?256,解得:n?8,这三个数是:256,258,128

20.解:(1)设原销售电价为每千瓦时x元,根据题意,得: ·········· 1分

·················· 5分 40(x?0.03)?60(x?0.12)?54

解得:x?0.60. ························ 6分 答:南昌市现行电价每千瓦时0.60元.

(2) 100?0.60?54?6(元) ····················· 7分 答:如不使用分时电价结算,小明家10月份将多支付6元. ········ 8分

六、课题学习

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