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1、南宁市三美学校2014初二下学期第一次月考数学试卷南宁市三美学校2013,2014学年下学期初二数学第一次月考数学试卷 (考试时间:120分钟 总分:120分) 一、选择题(每题3分，共36分) 11.给出四个数0，0.3，其中最小的是( ) 2,21A( 0 B( C( D. 0.3 2,22. 已知一粒大米的质量约为0.000021千克，这个数用科学记数法表示为( ) ,4,4A( 0.2110 B(2.110 ,6,5C( 2110 D. 2.110 3. 如图，?1，?2，?3的大小关系为( ) A(?2，?1，?3 B(?1，?3，?2 3 C(?3 ，?2，?1 1 D. ?1，?
2、2，?3 2 x，y12x4. 式子? ? ? ?中，是分式的有( ) x52,a,1A(? B(? ? C(? D. 5. 下列计算正确的是( ) 13253233a,b,a2a，a,2a2a,a,2aA( B( C( D. (,2ab),2abb6. 在下列线段a, b, c 的长为三边的三角形中，不能构成直角三角形的是( ) 52A(a=9, b=40, c=41 B(a=b=5, c= C(a:b:c=3:4:5 D. a=11, b=12, c=15 7. 如图，AC,AD，BC,BD，则有( ) A(AB与CD互相垂直平分 C B(CD垂直平分AB A B C(AB垂直平分CD D
3、. 以上答案都不对。 D 28. 若在实数范围内有意义，则的取值范围是( ) aa，2A.a-2 B(a?-2 C(a8%, diameter 760mm, not 6%. 7.7.4 making cables buried piping application root production, growing where interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve shou
4、ld have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge . 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situations. 7.8.1.8 metal temperatu
5、re of the insulating layer (hot) = shell-wall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and finish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum,
6、paint particles and visible brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, c
7、avitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structure placement process. 1 fair-faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able to displa
8、y strength and aesthetic perception of quality standards. Construction technology requirements are as follows: template template Panel selection and processing require plate high strength, good toughness and 地面6米处折断倒下，量得倒下部分的长是10米，也门在外的张大爷担心自已怕房子被倒下的大树砸到，大树倒下时能砸到张大爷的房子吗,请你通过计算、分析后给出正确的回答( ) A(下定不会 B
9、( 可能会 C(一定会 D. 以上答案都不对 12.如图，动点P从(0，3)沿所示的方向运动，每当碰到矩形的边时反弹，反弹时反射角等于入射角，当点P第2013次碰到矩形的边时，点P的坐标为( ) A(1，4) B(5，0) C(6，4) 4 D. (8，3) 3 2 1 二、填空题(每小题3分,共18分) O 3 5 2 6 4 8 1 7 1 x，1,0 13.不等式组 的解为 21,x 0 3x,4x,14. 分解因式: 15. 在活动课上，小红已有两根长为4cm, 8cm的小木棒，现打算拼一个等腰三角形，则小红应取的第三根小木棒长是 cm 16. 一个书包进价为60元，打八折销售后仍获利
10、20%，这个书包原价为 元。 2b,(b,a),17. 已知，实数a, b 在数轴上对应点的位置如图所示，化简: 18. 勾股定理有着悠久的历史，它曾引起很多人的兴趣。1955年希腊发行了一枚以勾股图为背景的邮票，所谓勾股图是指以直角三角形的三边为边向外作正方形构成，它可以验正勾股,定理.在右图的勾股图中，已知?ACB,90，?BAC,30，AB,4，作PQR使得?R,90，点H在边QR上，点D、E在边PR上，点G、F在边PQ上，那么PQR的周长等于 。 Q G H F C K B A P R ED F should be tightened, no loose, Terminal Board
11、 wiring should be one on each side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the
12、 bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not 8%, diameter 760mm, not 6%. 7.7.4 making cables buried piping application root production, growing where interface is required, only straight pipe, only the wire port
13、 connections, welded connections are not allowed. 7.7.5 service sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge . 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment sha
14、ll have sufficient expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shell-wall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and finish. 7.8.2.2 paint appearanc
15、e color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance should never show surrounded by glass fiber
16、cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structure placement process. 1 fair-faced concrete is a concrete surface without any decoration
17、, structure appearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Construction technology requirements are as follows: template template Panel selection and processing require plate high strength, good toughness and 三. 解答题(共66分) 1,10
18、(),(5,),|,3|，419. 计算: 33x,33x1,20. 先化简，再求值 2x，1x,1x,121441x,x，(1),其中x, 2121x,x,21. 如图，方格纸中每个小方格都是边长为1的正方形，我们把以格点连线为边的多边形称为“格点多边形”，如图(一)中四边形ABCD就是一个“格点四边形”， (1)求图(一)中四边形ABCD的面积; (2)在图(二)方格纸中画一个格点三角形EFG，使,FEG的面积等于四边形ABCD的面积且为轴对称图形。 A D B C 22. 某校体育组为了了解学生喜欢的体育项目，从全校同学中随机抽取了若干名同学进行调查，每位同学从乒乓球、篮球、排球中选择一
19、项最喜欢的项目，并将调查结果纭制成如下的两幅统计图，根据以上统计图，解答下列问题上: should be tightened, no loose, Terminal Board wiring should be one on each side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube making use of galvanized ste
20、el pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not 8%, diameter 760mm, not 6%. 7.7.4 making cables buried piping application root
21、 production, growing where interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.7.5 service sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridg
22、e . 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shell-wall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and
23、 pipelines should have at least a primer (red paint) and finish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber
24、glass fabric corrosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection should be no delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structu
25、re placement process. 1 fair-faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Construction technology requirements are as follows: template template Panel se
26、lection and processing require plate high strength, good toughness and (1)这次被调查的共有多少名同学,并补全条形统计图。 (2)若全校有1200名同学，估计全校最喜欢篮球和排球的共有多少名同学, 23. 如图，,ABC与DCB中，AC与BD交于点E，且?A,?D，AB,DC. 化简后即为： 这就是抛物线与x轴的两交点之间的距离公式。,(1)求证:ABE?DCE; 顶点坐标：（，）(2)当?AEB,50?，求?EBC的度数。 三三角函数的计算D A E C B 定义：在RtABC中，锐角A的对边与邻边的比叫做A的正切，记作
27、tanA，24. 如图，在多边形ABCD中，AB,2，CD,1，?A,45?，?B,?D,90?，求多边形ABCD的面积。 (6)直角三角形的外接圆半径D A 186.257.1期末总复习及考试C B 25. 列方程解应用题 tanA没有单位，它表示一个比值，即直角三角形中A的对边与邻边的比；甲、乙两个清洁队共同参与了城中垃圾场的清运工作，甲队单独工作2天完成总量的三分之一，这时增加了乙队，两队又共同工作了1天，总量全部完成，那么乙队单独完成总量需要多少天, (2)两锐角的关系：AB=90；should be tightened, no loose, Terminal Board wiring
28、 should be one on each side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend r
29、adius should be ? 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not 8%, diameter 760mm, not 6%. 7.7.4 making cables buried piping application root production, growing where interface is required, only straight pipe, only the wire port connec
30、tions, welded connections are not allowed. 7.7.5 service sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge . 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have
31、 sufficient expansion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shell-wall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and finish. 7.8.2.2 paint appearance color
32、 uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance should never show surrounded by glass fiber cloth u
33、niform, dense, painted pitch inspection should be no delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structure placement process. 1 fair-faced concrete is a concrete surface without any decoration, struc
34、ture appearance quality of concrete structure that is able to display strength and aesthetic perception of quality standards. Construction technology requirements are as follows: template template Panel selection and processing require plate high strength, good toughness and (3) 扇形的面积公式:扇形的面积 (R表示圆的
35、半径, n表示弧所对的圆心角的度数)26.在?ABC中，AB,，AC,4，BC,2，以AB为边在?ABC外作?ABD，使?ABD2512.与圆有关的辅助线为等腰直角三角形。 (1)如图，延长CB，过点D作DE?CB于点E，请写出图中的一对全等三角形，并求线段CD的长。 (2)以AB为边向外作的等腰直角三角形?ABD还有其他作法吗,如果有，请在备用图中画出图形，并求线段CD的长。 A A C B C B should be tightened, no loose, Terminal Board wiring should be one on each side, no more than two
36、. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radius should be ? 4 times times the outer dia
37、meter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not 8%, diameter 760mm, not 6%. 7.7.4 making cables buried piping application root production, growing where interface is required, only straight pipe, only the wire port connections, welded connections are not allowed. 7.
38、7.5 service sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge . 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expansion gap in hot situations.
39、7.8.1.8 metal temperature of the insulating layer (hot) = shell-wall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and finish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrink
40、les, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance should never show surrounded by glass fiber cloth uniform, dense, painted pitch inspection shoul
41、d be no delamination, cavitation, homogeneity of asphalt coating, brushing each layer thickness in accordance with design requirements. Standard 7.9 7.9 structure placement process. 1 fair-faced concrete is a concrete surface without any decoration, structure appearance quality of concrete structure
42、 that is able to display strength and aesthetic perception of quality standards. Construction technology requirements are as follows: template template Panel selection and processing require plate high strength, good toughness and should be tightened, no loose, Terminal Board wiring should be one on
43、 each side, no more than two. J, shielded wire, spare wire binding order, reliable grounding. 7.7 quality standard 7.7.l cables through the cable embedded tube making use of galvanized steel pipe, tube ends without burrs, smooth. 7.7.2 pipe does not allow bending, bending the bend radius should be ?
44、 4 times times the outer diameter of the tube in. 7.7.3 ellipticity of a bent tube, pipe diameter ? 60mm, not 8%, diameter 760mm, not 6%. 7.7.4 making cables buried piping application root production, growing where interface is required, only straight pipe, only the wire port connections, welded con
45、nections are not allowed. 7.7.5 service sleeve should have a good grounding. 7.7.6 cable trays installation, burrs and dirt and corrosion treatment should be carried out, install the bridge . 7.8.1.7 piping and piping, equipment and equipment or piping and other equipment shall have sufficient expan
46、sion gap in hot situations. 7.8.1.8 metal temperature of the insulating layer (hot) = shell-wall temperature of environment temperature ? 40 ? c. 7.8.2 paint 7.8.2.l paint of equipment and pipelines should have at least a primer (red paint) and finish. 7.8.2.2 paint appearance color uniform, without paint, rust, flaking, wrinkles, flow marks, scum, paint particles and visible brush marks. 7.8.2.3 interlayer should be tight and without stratification. 7.8.2.4 pipelines asphalt, fiber glass fabric corrosion, external appearance should never show surrounded by glass fiber cloth