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1、2011淮安中考数学试题及答案2011年淮安中考数学试题 一、选择题,本大题共有8小题每小题3分共24分。在每小题所给出的四个选项中恰有一项是符合题目要求的请将正确选项前的字母代号填涂在答题卡相应位置上, (1( 3 的相反数是( ) 11A. -3 B. - C. D. 3 332(下列交通标志是轴对称图形的是( ) 3(据第六次全国人口普查数据公报，淮安市常住人口约为480万人. 480万(即4800000)用科学记数法可表示为( ) 4567A. 4.810 B. 4.810 C. 4.810 D. 4.810 4(如图所示的几何体的主视图是( ) 5(在菱形ABCD中，AB=5cm，则
2、此菱形的周长为( ) A. 5cm B. 15cm C. 20cm D. 25cm 6(某地区连续5天的最高气温(单位:?)分别是30,33,24,29,24.这组数据的中位数是( ) A.29 B.28 C.24 D.9 3x，27(不等式,的解集是 ( ) x20,2,12A. , B. , C. , D. , xxxxky,8(如图，反比例函数的图象经过点A(-1,-2). x则当x,1时，函数值y的取值范围是( ) A.y,1 B.0,y,1 C. y,2 D.0, y,2 Shang, and action Shang with to XI comrade for General S
3、ecretary of Central keep height consistent; any when are put discipline rules is in front, enhanced organization concept, and obey Organization decided; to set right of worldview, and Outlook on life And to lead a clean slim family, always adhere to the Communists spiritual home; to consciously prac
4、tice the partys purpose, keeping qualities. CPC requirements in section-level cadres above to be a benchmark, play an exemplary role, adhere to the loyal clean play, Jiao Yulu-a good cadre of activities carried out in the ordinary party members practicing pioneer standard post set up activities. We
5、all party members to further enhance political par core, situation awareness, awareness, awareness, belief and faith, according to positions, downtown River regulation, diversion of hydraulic Process, protection of the mother River, rural safety water drinking project, construction of flood control
6、and drought relief, water in ecological civilization construction and other key, think, often, more active, hands-on, disciplined and strict rules, play, courage, give full play to the exemplary role, the successful completion of tasks. Three reform as the core of real change, completely change, and
7、 change image. This fundamental aim of education in order to solve the problem, for this reason, we insist on problem-oriented, enhance the awareness of problems, problems of reform in place, continuous improvement in style, to better serve the people, to better promote the water conservancy work. F
8、irst of all, to find the problem. Im learning education programme, in view of the current construction of the party, proposed to focus on solution of fuzzy ideals and beliefs waver, consciousness, purpose of the party weak sense, honesty and self-discipline awareness is not strong, depressed, six is
9、sues of ethical misconduct. Vast numbers of party members and cadres should closely real life personal and ideological work, reflections on the standard control, check the pendulum problem, pinpoint problems, get real, deep, identification, find the main target, laying the Foundation for further cor
10、rective action implementation. 二、填空题(本大题共有10个小题，每小题3分，共30分。不需要写出解答过程，请把答案直接 写在答题卡相应位置上) 429(计算: . a,a,10(如图，在?ABC中，D、E分别是边AB、AC的中点，BC=8， 则DE= . 11(分解因式: . ax，ay,bb12(如图，直线、被直线所截，?，?1=70?，则aca?2= . 213(一元二次方程的解是 . x,4,0214(抛物线的顶点坐标是 . y,x,2x,315(在半径为6cm的圆中，60?的圆心角所对的弧等于 . 16(有一箱规格相同的红、黄两种颜色的小塑料球共1000
11、个.为了估计这两种颜色的球各有多少个，小明将箱子里面的球搅匀后从中随机摸出一个球记下颜色，再把它放回箱子中，多次重复上述过. 程后，发现摸到红球的频率约为0.6，据此可以估计红球的个数约为17(在四边形ABCD中，AB=DC，AD=BC.请再添加一个条件，使四边形ABCD是矩形.你添加的条件是 .(写出一种即可) 18(如图，在Rt?ABC中，?ABC=90?，?ACB=30?，将?ABC 绕点A按逆时针方向旋转15?后得到?ABC，BC交AC于点D， 111122如果AD=，则?ABC的周长等于 . 三、解答题,本大题共有10小题共96分。请在答题卡指定区域内作答解答时应写出必要的文字说明、
12、证明过程或演算步骤, 19.(本题满分8分) 022，,5，2,3，1(1)计算: (2)化简: ，a，b，ba,b20.(本题满分8分) 如图，四边形ABCD是平行四边形，EF分别是BC、AD上的点，?1=?2. 求证:?ABE?CDF. Shang, and action Shang with to XI comrade for General Secretary of Central keep height consistent; any when are put discipline rules is in front, enhanced organization concept, a
13、nd obey Organization decided; to set right of worldview, and Outlook on life And to lead a clean slim family, always adhere to the Communists spiritual home; to consciously practice the partys purpose, keeping qualities. CPC requirements in section-level cadres above to be a benchmark, play an exemp
14、lary role, adhere to the loyal clean play, Jiao Yulu-a good cadre of activities carried out in the ordinary party members practicing pioneer standard post set up activities. We all party members to further enhance political par core, situation awareness, awareness, awareness, belief and faith, accor
15、ding to positions, downtown River regulation, diversion of hydraulic Process, protection of the mother River, rural safety water drinking project, construction of flood control and drought relief, water in ecological civilization construction and other key, think, often, more active, hands-on, disci
16、plined and strict rules, play, courage, give full play to the exemplary role, the successful completion of tasks. Three reform as the core of real change, completely change, and change image. This fundamental aim of education in order to solve the problem, for this reason, we insist on problem-oriented, enhance the awareness of problems, problems of ref
