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1、张店中学2009年七年级下学期数学竞赛试题及答案张店中学2009年七年级下学期数学竞赛试题 (满分:100分 时间:120分钟) 一、选择题(每小题4分,共40分) 1.若a0 , ab0 , 那么等于( ) b,a，1,a,b,5A. 4 B.-4 C.-2a+2b+6 D. 1996 2.数轴上坐标是整数的点称为整点,某数轴的单位长度是1厘米,若在这个数轴上随意画出一条长为2009厘米的线段AB,则线段AB盖住的整点的个数是( ) A.2008 或2009 B. 2008或 2010 C. 2009 或2010 D . 2010 或2011 xa,xy，,25,3.已知是方程组的解, 则a
2、-b的值为( ) ,yb,27xy，,A、2 B、1 C、0 D、-1 4.两个10次多项式的和是( ) A、20次多项式 B、10次多项式 C、100次多项式 D、不高于10次的多项式 5.若a3 , 则不等式(a-3)x1 B、x-1 D、x0，则当x=时，；若a0，则当x=时，AD对圆的定义的理解：圆是一条封闭曲线，不是圆面；E O F2、在教师的组织和指导下，通过自己的主动探索获得数学知识，初步发展创新意识和实践能力。CG B 面对新的社会要求，教师与学生应首先走了社会的前边，因此我们应该以新课标要求为指挥棒，采用所有可行的措施，尽量体现以人为本，培养学生创新，开放的思维方式。另一方面
3、注意处理好内容与思想的衔接，内容要在学生上学期的水平之上发展并为以后学习打下基础，思想上注意新思维与我国传统的教学思想结合the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the com
4、pany. (3) personal injury accident occurs, the direct punishment 500-1000, who is directly responsible for the accident responsibility, give notice of criticism and 50-100 economic sanctions against them. (4) to conceal the accident, reported without undue delay or false, to inform the administrativ
5、e leadership of the criticism, resulting in serious consequences, the pursuit of leadership, along with 500-1000 punishment. (5) significant near miss should be attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight,
6、should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industr
7、ial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for steel pressure
8、vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressu
9、re vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded 参考答案: 一. BCADACC,D C 2008二. 11 ; 12 -45 ;13540 ? ;14. ; 15 45 ;16 3 2009(6）三角形的内切圆、内心.x,3z4x,3y,6z,三. 17. 解得 代入原式得, 原式 = -13 y,2zx，2y,7z推论2 经过切点且垂直于切线的直线必经过圆心.18. 证?DE?BC , ? ?1=?BCD , 又?1=?2 对圆的定义的理解：圆
10、是一条封闭曲线，不是圆面；?2=?BCD ?FG?CD 又CD?AB ?FG?AB 19.(1) a,800,b,600(2)初三年级学生可捐助的贫困中、小学生人数分别为4人和7人。 20(略 21(275; 22. 50: the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of lea- 5 - dership, such as concerning administrative sanctions s
11、hould be dealt with by the personnel Department of the company. (3) personal injury accident occurs, the direct punishment 500-1000, who is directly responsible for the accident responsibility, give notice of criticism and 50-100 economic sanctions against them. (4) to conceal the accident, reported
12、 without undue delay or false, to inform the administrative leadership of the criticism, resulting in serious consequences, the pursuit of leadership, along with 500-1000 punishment. (5) significant near miss should be attempted as the case of responsible for the accident and construction team injur
13、ies accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspe
14、ction and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2
15、000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded