1、2007-2008中山市教育教学联合体期中联考七年级下数学试卷(考试时间100分钟,满分120分)一选择题(本大题共5小题,每小题3分,共15分)1ABC中,A50,B60,则C( )A、50 B、60 C、70 D、90 2如图1,若mn,1 = 75,则2 =( )A、105 B、75 C、95 D、653如图2,点A的坐标是( )A、(2,3) B、(-2,-3) C、(3,2) D、(-3,-2)4下列语句不是命题的是( )、两直线平行,内错角相等 、点到直线的距离 、若a=b,则a=b 、小明是七年级(2)班学生5如图,一扇窗户打开后,用窗钩AB可将其固定,这里所运用的几何原理是(
2、)A、三角形的稳定性 B、两点之间线段最短 C、两点确定一条直线 D、垂线段最短二填空题(本大题共5小题,每小题4分,共20分)6_边形的内角和等于5400,正十边形的一个外角等于 .7 若点A(m-1,m+2)在平面直角坐标系的x轴上,则点A的坐标为 .8如图3,直线AB、CD相交于点O,O为垂足,如果,则 .9如图4,ABC中,ACB=90,CDAB,垂足为D,若AC=8cm,BC=6cm,AB=10cm,那么CD=_.10已知点P在第四象限,距离轴1个单位长度,距离轴2个单位长度,则点P的坐标为 .三解答题(本大题共5小题,每小题6分,共30分)11如图5所示,直线AB,CD,EF相交于
3、点O。(1)请写出AOE的对顶角;(2)请写出AOD的邻补角。12如图,AD是EAC的平分线,ADBC,EAC=60,你能算出B,C的度数吗?13求出下列图中的的值:14如图是某市区的部分简图,请建立适当的平面直角坐标系,并分别写出各地的坐标(每一个单位长度相当于100米)。15作图题:如图,画出ABC的角平分线AD、中线AE和高AF。四解答题(本大题共4小题,每小题7分,共28分)16如图,已知,求的度数.123417如图所示,四边形ABCD中,ABBC,C=600,且D-BAD=100,求1。18已知等腰三角形的周长为20cm,一边长为6cm,求它的另两边长。19如图,平分,与相交于,。
4、求证:。五解答题(本大题共3小题,每小题9分,共27分)xy20已知在如图平面直角坐标系中,三个顶点坐标分别为,(1)在平面直角坐标系中画出;(2)将向右平移6个单位长度,画出平移后的,并写出对应点的坐标。21已知:在如下四个图形中,ABCD,(1)图1中P与A,C的关系满足:P+A+C=360,请说明理由。(2)分别探讨其余的三个图形中,P与A,C的关系,请你从所得三个关系中任意选取一个说明理由.图1图2图3图422如图,AD是ABC的角平分线,34,56,EFBC于E。(1)若ABC36,ACB=100,则8 ,7 。(2)若ABC40,ACB=80,则8 ,7 。(3)猜想:8与7的大小
5、关系 。(4)试对猜想加以证明。 2007-2008中山市教育教学联合体期中联考七年级下数学参考答案及评分标准一选择题(每小题3分)题号12345答案CBCBA二选择题(每小题4分,其中第6题每空2分)题号678910答案五,360(-3,0)5404.8 cm(1,-2)三解答题(每小题6分)11(1)AOE的对顶角是BOF;(3分)(2)AOD的邻补角是AOC和BOD,(6分)12为AD是EAC的平分线,EAC=60所以EAD=DAC=300(3分)又因为ADBC所以B=EAD =300,C=DAC=300(6分)13由图可得:x+2x+600=1800(3分)解之得:x=400(6分)1
6、4标系建立的位置不同,答案就不同,这里以火车站为原点,提供一组答案,共参考:火车站(0,0);宾馆(200,200);超市(200,-300);医院(-200,-200);文化宫(-300,100);体育场(-400,300);市场(400,300)。(建立正确的直角坐标得2.5分;坐标对一个得0.5分)15右图所示:(每作对一种给2分)16因为,1234所以 (2分)65 所以 (4分)所以 (5分) 又因为 ,且 所以 (7分)(其他情况酌情给分)17因为ABBC,C=600,所以DBAD=2100,(2分)又因为DBAD=100,可求得BAD=1000,(5分)所以1=800. (7分)
7、18两边长分别为7cm和7cm或6cm和8cm(答对一种情况得4分,两种全对者得7分)19因为 ,所以 (1分)又因为,所以 (3分)因为 平分,所以 (4分)所以 (6分)所以 (7分)20(1) (4分); (2)(9分); 21(1)(3分)(2)图2中,P与A,C的关系是; (4分)图3中,P与A,C的关系是; (5分)图4中,P与A,C的关系是; (6分)理由答对即得9分22(1)8 40 ,7 40 (2分)(2)8 50 ,7 50 。(2分)(3) 8=7 。(2分)(4)因为7=1+2= 且8=90-5=90-=90-=所以7=8 (9分)作为一名测量人员,xx认真履行岗位职
8、责,紧密配合施工,制定切实可行的的测量放线方案。保罗回忆自己年少时癿经历,丌断怃耂生命、医疗、道德不哲学乊间癿兰系,丌仅为从医考提供了新规觇,使他们对自己癿职业呾使命有更为深入癿怃耂,耄丏为读考引路,觑人们更勇敢、沉着地看待生命、死亜不未来。situation, causing the livelihood of 100 tailings project management project and South Mining Technology in two engineering work lag. Corrective measures: (LED Leadership: Luo Min
9、gjun, rectification time: before September 25th, insist for a long time) 1, strictly abide by the partys political discipline. Strictly abide by the constitution, the principle of Party organization and party political life standards, do not spread against the partys theory and policy advice, not co
10、ntrary to published The central and provincial Party committee decided to talk, not to divulge the secrets of the party and the state, do not make no illegal organization and participate in various activities, political, spread rumors and false information, not to publish lossy unity of speech, do n
11、ot damage the unity of things, and never allow individuals above the organization. 2, adhere to the scientific and democratic decision-making the decision to make decisions. Correctly handle to ensure that government decrees and based on the actual creative work, giving full play to subjective initi
12、ative, put an end to implement the conference meeting, to document the implementation of documents and so on. To improve the scientific and democratic decision-making mechanism, improve and implement the decision to solicit opinions, experts, public hearings and other health system. All major decisi
13、ons before the risk assessment mechanism and legitimacy review mechanism. Adhere to the interests of the masses and the intention reflected in the policy making process and carry out the work, not acting on their behalf, across the board and coercion. (two) the existence of negative communication or
14、 unwilling to communication problems due to maintenance party team unity. The team members of the division of responsibilities, temperament, interestsDifferences in demand, often leads to different views, different opinions. Individual members of organization and coordination ability, team spirit is
15、 not good, work style is not real, simple working methods, lack of knowledge of the wisdom of the people, forgiveness and art for the people, can not deal with different opinions, there are self sweep the snow in front of the door, all kinds of responsibility fields. Some members of the team divisio
16、n of work coordination, lack of coordination, as extreme liberalization, did not form a work force. In addition, individual cadres lack of leadership training, love command communication, negative communication, talk in the work did not take the initiative to talk not correct The science team differ
17、ences, resolve conflicts. Corrective measures: (LED Leadership: Luo Mingjun, rectification time: before September 25th, insist for a long time) 1, to further strengthen the education and guidance on the implementation of the central eight provisions, the provincial nine provisions of the county committee of the ten provisions extensive publicity, eliminate the ideological