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数学试题第1页(共8页)ACDBαβαβαβαβBADCyExO10题图ABCDEF1211题图2019年学业水平阶段性调研测试数学试题第I卷(选择题共48分)一、选择题(本大题共12个小题,每小题4分,共48分.在每小题给出的四个选项中,只有一项是符合题目要求的.)1.(-3)2的值为A.-9B.9C.-6D.62.下面几何体中,主视图为矩形的是ABCD3.下列计算正确的是A.a+a=a2B.a3÷a=a2C.(a-1)2=a2-1D.(2a)3=6a34.如图,将一副三角尺按不同的位置摆放,下列摆放方式中,∠α与∠β互余的是5.如图,直线AB∥CD,则下列结论正确的是A.∠1=∠2B.∠3+∠4=180°C.∠1+∠3=180°D.∠3=∠46.分式方程311(1)(2)xxxx的解为A.x=1B.x=-1C.无解D.x=-27.不等式组372291xx≥<整数解的个数是A.4B.5C.6D.78.已知直线y=ax+b(a≠0)经过第一、二、四象限,则直线y=bx-a一定不经过A.第一象限B.第二象限C.第三象限D.第四象限9.如图,用四个直角边分别是6和8的全等直角三角形拼成“赵爽弦图”,随机往大正方形区域内投针一次,则针扎在小正方形EFGH内的概率是A.14B.16C.124D.1254321ABCD5题图FABCDE9题图GH数学试题第2页(共8页)AOCB16题图yACDEP1P2P3FxOB17题图10.如图,在菱形OABC中,点A的坐标为(10,0),对角线OB、AC相交于点D,OB•AC=160.双曲线y=xk(x>0)经过点D,交BC的延长线于点E,则过点E的双曲线表达式为A.xy20B.xy24C.xy28D.xy3211.如图,矩形ABCD长与宽的比为3∶2,点E、F分别在边AB、BC上,tan∠1=21,tan∠2=31,则cos(∠1+∠2)的值为A.23B.22C.32D.112.如图,抛物线3415432xxy与x轴交于A、B两点(点A在点B的左侧),与y轴交于点C,点Q是线段OB上一动点,连接BC,点M在线段BC上,且使△BQM为直角三角形的同时△CQM为等腰三角形,则此时点Q的横坐标为A.920或73B.23或720C.23或73D.720或920第Ⅱ卷(非选择题共102分)注意事项:所有答案必须用0.5毫米的黑色签字笔(不得使用铅笔和圆珠笔)写在答题卡各题目指定区域内(超出方框无效),不能写在试卷上,不能使用涂改液、修正带等.不按以上要求做答,答案无效.二、填空题(本大题共6个小题.每小题4分,共24分.把答案填在答题卡的横线上.)13.3月7日~3月12日,“2019槐荫区数学文化年”标志评选活动在“勾股数学”微信公众号上进行,最终该评选页面的点击量为11000次,11000用科学记数法表示为____________.14.在-2,1,4,-3,0这5个数中,任取一个数是负数的概率是____________.15.计算:[(x+y)2-(x-y)2]÷2xy=____________.16.如图,点B、C在⊙O上,OC⊥OB,点A在劣弧BC上,且OA=AB,则∠ABC的度数为____________.17.如图,以正六边形ABCDEF的中心O为原点建立平面直角坐标系,过点A作AP1⊥OB于点P1,再过P1作P1P2⊥OC于点P2,再过P2作P2P3⊥OD于点P3,依次进行……若正六边形的边长为1,则点P2019的横坐标为__________.xyABCOQ12题图数学试题第3页(共8页)FEMGDCBA18题图ECBAD21题图18.如图,线段AB=4,点C为线段AB上任意一点(与端点不重合),分别以AC、BC为边在AB的同侧作正方形ACDE和正方形CBGF,分别连接BF、EG交于点M,连接CM,设AC=x,S四边形ACME=y,则y与x的函数表达式为y=____________.三、解答题(本大题共9个小题,共78分.解答应写出文字说明,证明过程或演算步骤.)19.(本小题满分6分)分解因式:2233ba20.(本小题满分6分)计算:21422aaa21.(本小题满分6分)如图,点C是线段AB上任意一点,分别以AC、BC为边在AB的同侧作等边△ACD和等边△BCE,分别连接AE、BD.求证:AE=BD.22.(本小题满分8分)有大小两种货车,3辆大货车与4辆小货车一次可以运货18吨,2辆大货车与6辆小货车一次可以运货17吨.(1)求1辆大货车和1辆小货车一次可以分别运货多少吨;(2)现有31吨货物需要运输,货运公司拟安排大小货车共10辆把全部货物一次运完.求至少需要安排几辆大货车?数学试题第4页(共8页)PDCOBA23题图23.(本小题满分8分)如图,AB是⊙O的直径,点P是BA延长线上一点,PC是⊙O的切线,切点为C,过点B作BD⊥PC交PC的延长线于点D,连接BC.求证:(1)∠PBC=∠CBD;(2)BC2=AB•BD.24.(本小题满分10分)某校为激发学生学习数学的兴趣,开设了“数独、速算、魔方、七巧板、华容道”五门校本课程,规定每位学生只能选一门.该校共有学生1600人.为了解学生的报名意向,学校随机调查了一些学生,并制成如下统计图表:校本课程报名意向统计表课程频数频率数独8a速算m0.2魔方27b七巧板n0.3华容道15c(1)在这次活动中,学校采取的调查方式是(填写“普查”或“抽样调查”)(2)求出扇形统计图中“速算”所对应的扇形圆心角的度数;(3)a+b+c=,m=;(答案直接填写在横线上)(4)请你估算,全校选择“数独”和“魔方”的学生共有多少人?数学试题第5页(共8页)ABO25题图1yxABO25题图2EFDyx25.(本小题满分10分)如图1,点A(m,6),B(6,1)在反比例函数图象上,作直线AB,连接OA、OB.(1)求反比例函数的表达式和m的值;(2)求△AOB的面积;(3)如图2,E是线段AB上一点,作AD⊥x轴于点D,过点E作x轴的垂线,交反比例函数图象于点F,若EF=13AD,求出点E的坐标.数学试题第6页(共8页)PBACxyOB′26题图1PBACxyOB′26题图2C′Q26.(本小题满分12分)已知一个矩形纸片OACB,将该纸片放置在平面直角坐标系中,点A(4,0),点B(0,3),点P为BC边上的动点(点P不与点B、C重合),经过点O、P折叠该纸片,得点B′和折痕OP.设BP=t.(1)如图1,当∠BOP=30°时,求点P的坐标;(2)如图2,经过点P再次折叠纸片,使点C落在直线PB′上,得点C′和折痕PQ,设AQ=m,试用含有t的式子表示m;(3)在(2)的条件下,连接OQ,当OQ取得最小值时,求点Q的坐标;(4)在(2)的条件下,点C′能否落在边OA上?如果能,直接写出点P的坐标;如果不能,请说明理由.数学试题第7页(共8页)OCADByx27题图27.(本小题满分12分)如图,抛物线y=ax2+bx+3与x轴交于A(-1,0)和B(3,0)两点,与y轴交于点C,点D是该抛物线的顶点,分别连接AC、CD、AD.(1)求抛物线的函数表达式以及顶点D的坐标;(2)在抛物线上取一点P(不与点C重合),并分别连接PA、PD,当△PAD的面积与△ACD的面积相等时,求点P的坐标;(3)将(1)中所求得的抛物线沿A、D所在的直线平移,平移后点A的对应点为A′,点C的对应点为C′,点D的对应点为D′,当四边形AA′C′C是菱形时,求此时平移后的抛物线的解析式.数学试题第8页(共8页)数学试题参考答案与评分标准一、选择题题号123456789101112答案BABABCCDDDBC二、填空题13.1.1×104;14.25;15.2;16.15;17.;18.2x三、解答题19.解:3a2-3b2=3(a2-b2)························································································3分=3(a+b)(a-b)··················································································6分20.解:=2a(a+2)(a-2)-1a-2·································································1分=2a(a+2)(a-2)-a+2(a+2)(a-2)·······················································2分=·················································································3分=·················································································4分=·················································································5分=···························································································6分21.解:∵△ACD和△BCE是等边三角形,∴AC=DC,EC=BC,∠ACD=∠BCE=60°.········································2分∴∠ACD+∠DCE=∠BCE+∠DCE.···················································3分∴∠ACE=∠BCD.···········································································4分∴△ACE≌△DCB.···········································································5分∴AE=BD.·····················································································6分22.解:(1)设1辆大货车一次运货x吨,1辆小货车一次运货y吨,············1分········································································4分①×2-②×3,得-10y=-15.∴y=1.5.把y=1.5代入①,得x=4,∴x=4y=1.5··························································································5分(2)设货物公司安排大货车m辆,则小货车需要安排(10-m)辆,4m+1.5(10-m)≥31.····························································6分202021-21422aaa)2)(2()2(2aaaa)2)(2(22aaaa-)2)(2(2aaa-21a34182617xyxy ① ②数学试题第9页(共8页)23题答案图ADCPBO解得m≥6.4.·······································································7分∵m为正整
本文标题:2019年济南市槐荫区一模真题(有答案)
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