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精品文档.数学试题卷考生须知:1.本试卷分为试题卷和答题卷两部分.2.试题卷共4页,满分150分.考试时间120分钟.3.答题卷共4页,所有答案必须写在答题卷上............,写在试题卷上的无效..........4.答题前,考生应先在答题卷密封区内认真填写准考证号、姓名、考场号、座位号、地(州、市、师)、县(市、区、团场)和学校.5.答题时可以使用科学计算器..........一、精心选择(本大题共8小题,每小题5分,共40分.每小题所给四个选项中,只有一个是正确的.)1.8的相反数是A.8B.8C.18D.182.计算23()a的结果是A.5aB.6aC.6aD.5a3.如右图,小明课间把老师的三角板的直角顶点放在黑板的两条平行线ab、上,已知155°,则2的度数为A.45°B.35°C.55°D.125°4.今年我区约有202000名应届初中毕业生参加学业水平考试,202000用科学记数法表示为A.60.20210B.320210C.420.210D.52.02105.如果从小军等10名大学生中任选1名作为“世博会”志愿者,那么小军被选中的概率是A.1B.111C.110D.196.如图(1)是一张RtABC△纸片,如果用两张相同的这种纸片恰好能拼成一个正三角形,如图(2),那么在RtABC△中,sinB的值是A.12B.32C.1D.327.若点1122()()AxyBxy,、,在反比例函数3yx的图象上,且120xx,则12yy、和0的大小关系是A.120yyB.120yyC.120yyD.120yy新疆维吾尔自治区新疆生产建设兵团2010年初中学业水平考试第3题图ABC图(1)图(2)精品文档.8.如右图,王大爷家屋后有一块长12m,宽8m的矩形空地,他在以BC为直径的半圆内种菜,他家养的一只羊平时拴在A处,为了不让羊吃到菜,拴羊的绳长可以选用A.3mB.5mC.7mD.9m二、合理填空(本大题共6个小题,每小题5分,共30分)9.化简188___________.10.写出右图中所表示的不等式组的解集:____________.11.甲、乙两位棉农种植的棉花,连续五年的单位面积产量(千克/亩)统计如下图,则产量较稳定的是棉农_________.(填甲或乙)12.利用1个aa的正方形,1个bb的正方形和2个ab的矩形可拼成一个正方形(如图所示),从而可得到因式分解的公式__________.13.长方体的主视图和左视图如下图所示(单位:cm),则其俯视图的面积是_________cm2.14.抛物线2yxbxc的部分图象如图所示,若0y,则x的取值范围是__________.三、准确解答(本大题共有10题,共80分)15.(6分)解方程:22760xx16.(6分)先化简,再求值22111xxxxxx,其中31xABC8m12mDPO(第11题图)(第12题图)(第13题图)(第14题图)Oxy113精品文档.17.(6分)用四块如下图(1)所示的正方形卡片拼成一个新的正方形,使拼成的图案是一个轴对称图形,请你在图(2)、图(3)、图(4)中各画出一种拼法(要求三种画法各不相同,且其中至少有一个既是轴对称图形,又是中心对称图形)18.(6分)小王将一黑一白两双相同号码的袜子一只一只地扔进抽屉里,当他随意从抽屉里拿出两只袜子时,恰好成双与不成双的机会是多少?请你用树形图求解.19.(8分)2010年4月14日我国青海玉树地区发生强烈地震,急需大量赈灾帐篷.某帐篷生产企业接到任务后,加大生产投入,提高生产效率,实际每天生产帐篷比原计划多200顶,现在生产3000顶帐篷所用的时间与原计划生产2000顶的时间相同.现在该企业每天能生产多少顶帐篷?20.(8分)某瓜果销售公司去年3月至8月销售库尔勒香梨、哈密瓜的情况见下表:3月4月5月6月7月8月库尔勒香梨(吨)48581013哈密瓜(吨)8797107(1)请你根据以上数据填写下表:平均数方差库尔勒香梨89哈密瓜(2)补全右面折线统计图;(3)请你根据下面两个要求对这两种瓜果在去年3月份至8月份的销售情况进行分析:①根据平均数和方差分析;②根据折线图上两种瓜果销售量的趋势分析.21.(8分)圆心角都是90°的扇形AOB与扇形COD如图所示那样叠放在一起,连结ACBD、.(1)求证:AOCBOD△≌△;(2)若3AOcm,OC=1cm,求阴影部分的面积.(第20题图)ABCDO(第21题图)(2)(3)(4)(1)精品文档.22.(10分)如图(1),某灌溉设备的喷头B高出地面1.25m,喷出的抛物线形水流在与喷头底部A的距离为1m处达到距地面最大高度2.25m,试在恰当的直角坐标系中求出与该抛物线水流对应的二次函数关系式.学生小龙在解答图(1)所示的问题时,具体解答如下:①以水流的最高点为原点,过原点的水平线为横轴,过原点的铅垂线为纵轴,建立如图(2)所示的平面直角坐标系;②设抛物线水流对应的二次函数关系式为2yax;③根据题意可得B点与x轴的距离为1m,故B点的坐标为(1,1);④代入2yax得11a·,所以1a;⑤所以抛物线水流对应的二次函数关系式为2yx.数学老师看了小龙的解题过程说:“小龙的解答是错误的”.(1)请指出小龙的解答从第_________步开始出现错误,错误的原因是什么?(2)请你写出完整的正确解答过程.23.(10分)如图是一个量角器和一个含30°角的直角三角形放置在一起的示意图,其中点B在半圆O的直径DE的延长线上,AB切半圆O于点F,且.BCOE(1)求证:DECF∥;(2)当2OE时,若以OBF、、为顶点的三角形与ABC△相似,求OB的长.(3)若2OE,移动三角板ABC且使AB边始终与半圆O相切,直角顶点B在直径DE的延长线上移动,求出点B移动的最大距离.24.(12分)张师傅在铺地板时发现,用8块大小一样的长方形瓷砖恰好可以拼成一个大的长方形,如图(1).然后,他用这8块瓷砖又拼出一个正方形,如图(2),中间恰好空出一图(1)图(2)ABCO(第23题图)DFE精品文档.个边长为1的小正方形(阴影部分),假设长方形的长为y,宽为x,且.yx(1)请你求出图(1)中y与x的函数关系式;(2)求出图(2)中y与x的函数关系式;(3)在图(3)中作出两个函数的图象,写出交点坐标,并解释交点坐标的实际意义;(4)根据以上讨论完成下表,观察x与y的关系,回答:如果给你任意8个相同的长方形,你能否拼出类似图(1)和图(2)的图形?说出你的理由.图(2)中小正方形边长1234…x6y10…图(1)图(2)图(3)精品文档.数学试卷参考答案及评分标准(满分150分)说明:本参考答案供阅卷教师评卷时使用.阅卷中,考生如有其它解法,只要正确、合理,均可得相应分值.一、精心选择(本大题共8小题,每小题5分,共40分)题号12345678选项ACBDCBCA二、合理填空(本大题共6小题,每小题5分,共30分)9.210.32x≤11.乙12.2222()aabbab13.1214.31x三、准确解答(本大题共10小题,共80分)15.(6分)解法不唯一.例解:27302xx274949321616xx····································································2′271()416x··················································································4′7144x····················································································5′12x232x·········································································6′16.(6分)解:2222111111xxxxxxxxxxxx·=2211xxxxx·················································2′=(2)11xxxxx·················································3′=2x····························································4′当31x时,原式=31233·················································6′17.(6分)解法不唯一,例解如下:新疆维吾尔自治区新疆生产建设兵团2010年初中学业水平考试精品文档.每个图形2′,共6′18.(6分)··············································································································3′()13P成双································································································5′()23P不成双·····························································································6′19.(8)分例解:设现在该企业每天生产x顶帐篷,则原计划每天生产(200)x顶帐篷·········1′由题意得:30002000200xx·······································································4′解得600x····························································································6′经检验600x是原方程的解·······································································7′即该企业现在每天生产600顶帐篷································································8′20.(8分)解:(1)平均数方差库尔勒香梨89哈密瓜843··············································································································3′(2)如图··············································································································6′(1)(2)(3)精品文档.24.(12分)解法不唯一解:(1)由图(1)得:35yx53yx··················································2′(2)由图(2)得281(2)xyxy····························································3′整理得:2(2)
本文标题:新疆中考数学试题及答案
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