12999数学网[]精品资料下载免费下载『12999数学网』收集整理第1页共8页欢迎下载教学资料2009年清远市初中毕业生学业考试数学科试题说明:1.全卷共4页,考试时间为100分钟,满分120分.2.选择题每小题选出答案后,用2B铅笔把答题卡上对应题的答案标号涂黑;如需改动,用橡皮擦干净后,再选涂其他答案标号;不能答在试卷上.3.非选择题必须用黑色字迹的钢笔或签字笔作答,涉及作图的题目,用2B铅笔画图,再用黑色字迹的钢笔或签字笔描黑.答案必须写在答题卡各题指字区域内的相应位置上;如需改动,先划掉原来的答案,然后再写上新的答案;改动的答案也不能超出指定的区域.不准使用铅笔、圆珠笔和涂改液.不按以上要求作答的答案无效.4.考生必须保持答题卡的清洁,考试结束后,将本试卷和答题卡一半交回.一、选择题(本大题共10小题,每小题3分,共30分)在每小题给出的四个选项中,只有一个是正确的,请将所选选项的字母涂在相应题号的答题卡上.1.5等于()A.5B.5C.15D.152.不等式20x≤的解集在数轴上表示正确的是()A.B.C.D.3.今年我国参加高考人数约为10200000,将10200000用科学记数法表示为()A.710.210B.71.0210C.70.10210D.7102104.某物体的三视图如图1所示,那么该物体形状可能是()A.圆柱B.球C.正方体D.长方体5.小明记录某社区七次参加“防甲型H1N1流感活动”的人数分别如下:33,32,32,31,32,28,26.这组数据的众数是()A.28B.31C.32D.336.方程216x的解是()A.4xB.4xC.4xD.16x7.已知O⊙的半径r,圆心O到直线l的距离为d,当dr时,直线l与O⊙的位置关系是()A.相交B.相切C.相离D.以上都不对8.计算:23ab()A.22abB.23abC.26abD.6ab3210123321012332101233210123图1主视图左视图俯视图12999数学网[]精品资料下载免费下载『12999数学网』收集整理第2页共8页欢迎下载教学资料9.如图2,ABCD∥,EFAB于EEF,交CD于F,已知160°,则2()A.20°B.60°C.30°D.45°10.如图3,AB是O⊙的直径,弦CDAB于点E,连结OC,若5OC,8CD,则tanCOE=()A.35B.45C.34D.43二、填空题(本大题共6小题,每小题3分,共18分)请把下列各题的正确答案填写在相应题号的答题卡上.11.计算:3(2)=.12.当x时,分式12x无意义.13.已知反比例函数kyx的图象经过点(23),,则此函数的关系式是.14.如果a与5互为相反数,那么a.15.如图4所示,转盘平面被等分成四个扇形,并分别填上红、黄两种颜色,自由转动这个转盘,当它停止转动时,指针停在黄色区域的概率为.16.如图5,若111ABCABC△≌△,且11040AB°,°,则1C=.三、解答题(本大题共5小题,每小题5分,共25分)17.在“我喜欢的体育项目”调查活动中,小明调查了本班30人,记录结果如下:(其中喜欢打羽毛球的记为A,喜欢打乒乓球的记为B,喜欢踢足球的记为C,喜欢跑步的记为D)AACBADCCBCADDCCBBBBCBDBDBABCAB求A的频率.18.计算:201(1)π34.图4红红红黄ABCC1A1B1图5CDBAEF12图2ACDBEO图312999数学网[]精品资料下载免费下载『12999数学网』收集整理第3页共8页欢迎下载教学资料19.已知图形B是一个正方形,图形A由三个图形B构成,如右图所示,请用图形A与B合拼成一个轴对称图形,并把它画在答题卡的表格中.20.解分式方程:132xx21.如图6,某飞机于空中A处探测到地平面目标B,此时从飞机上看目标B的俯角为,若测得飞机到目标B的距离AB约为2400米,已知sin0.52,求飞机飞行的高度AC约为多少米?四、解答题(本大题共4小题,每小题6分,共24分)22.化简:222692693xxxxxx23.如图7,已知正方形ABCD,点E是AB上的一点,连结CE,以CE为一边,在CE的上方作正方形CEFG,连结DG.求证:CBECDG△≌△24.在一个不透明的口袋中装有红球2个、黑球2个,它们只有颜色不同,若从口袋中一次摸出两个球,求摸到两个都是红球的概率.(要求画出树状图)ABBCA图6EBCGDFA图712999数学网[]精品资料下载免费下载『12999数学网』收集整理第4页共8页欢迎下载教学资料25.已知二次函数2yaxbxc中的xy,满足下表:x…21012…y…40220…求这个二次函数关系式.五、解答题(本大题共3小题,第26小题7分,第27、28小题各8分,共23分)26.如图8,已知AB是O⊙的直径,过点O作弦BC的平行线,交过点A的切线AP于点P,连结AC.(1)求证:ABCPOA△∽△;(2)若2OB,72OP,求BC的长.27.某饮料厂为了开发新产品,用A种果汁原料和B种果汁原料试制新型甲、乙两种饮料共50千克,设甲种饮料需配制x千克,两种饮料的成本总额为y元.(1)已知甲种饮料成本每千克4元,乙种饮料成本每千克3元,请你写出y与x之间的函数关系式.(2)若用19千克A种果汁原料和17.2千克B种果汁原料试制甲、乙两种新型饮料,下表是试验的相关数据;每千克饮料果汁含量果汁甲乙A0.5千克0.2千克B0.3千克0.4千克请你列出关于x且满足题意的不等式组,求出它的解集,并由此分析如何配制这两种饮料,可使y值最小,最小值是多少?28.如图9,已知一个三角形纸片ABC,BC边的长为8,BC边上的高为6,B和C都为锐角,M为AB一动点(点M与点AB、不重合),过点M作MNBC∥,交AC于点N,在AMN△中,设MN的长为x,MN上的高为h.(1)请你用含x的代数式表示h.(2)将AMN△沿MN折叠,使AMN△落在四边形BCNM所在平面,设点A落在平面的点为1A,1AMN△与四边形BCNM重叠部分的面积为y,当x为何值时,y最大,最大值为多少?POACBBCNMA图912999数学网[]精品资料下载免费下载『12999数学网』收集整理第5页共8页欢迎下载教学资料2009年清远市初中毕业生学业考试数学试题参考答案及评分标准一、选择题:(每小题3分,共30分)1.A2.B3.B4.A5.C6.A7.B8.C9.C10.D二、填空题:(每小题3分,共18分)11.6;12.2;13.6yx;14.5;15.14;16.30°三、解答题:(每小题5分,共25分)17.解:A的频率=61305···············································································5分18.解:原式=11123···············································································4分=13··············································································································5分19.解:拼成正确图形之一的给5分,例如20.解:去分母,得36xx·········································································2分解得:3x··································································································3分检验:把3x代入原方程得:左边=右边····························································4分所以3x是原方程的解···················································································5分21.解:由题意得:90BC,°sinsin0.52B≈···················································································2分sinACBABsin24000.521248ACABB·(米)····························5分答:飞机飞行的高度约为1248米.四、解答题:(每小题6分,共24分)22.解:原式=2(3)(3)(3)(3)2(3)xxxxxx······························································4分=(3)(3)22xxxx·······················································································6分23.证明:四边形ABCD和四边形CEFG都是正方形90CBCDCECGBCDECG,,°················································3分90BCEDCE°-90DCGDCE°-BCEDCG························································································5分CBECDG△≌△·······················································································6分12999数学网[]精品资料下载免费下载『12999数学网』收集整理第6页共8页欢迎下载教学资料24.解:画出树状图为:·············································4分摸到两个都是红球的概率P=21126···································································6分25.解:把点(02),代入2yaxbxc得2c·············································2分再把点(10)(20),,,分别代入22yaxbx204220abab····························································································4分解得11ab这个二次函数的关系式为:22yxx························································6分(说明:其它解法可参照上述给分)五、解答题:(本大题共3小题,26题7分,27、28题各8分,共23分)26.(1)证明:BCOP∥AOPB·············································1分AB