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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

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2012—2013学年度第一学期南昌市期末终结性测试卷

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

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

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··························· 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

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，

（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

(?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

（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

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