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《大学英语(2)》期末考试A卷2020

《大学英语(2)》期末考试A卷2020
《大学英语(2)》期末考试A卷2020

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2020年九年级数学上册期末考试卷附答案人教版

九年级(上)期末数学试卷 一、单项选择题(共13小题,每小題4分,满分52分) 1.点A(2,﹣3)关于原点对称的点的坐标是() A.(﹣2,3)B.(﹣3,2)C.(3,﹣2)D.(﹣2,﹣3) 2.下列方程是一元二次方程的是() A.x﹣1=0 B.2x2﹣y﹣3=0 C.x﹣y+2=0 D.3x2﹣2x﹣1=0 3.关于x的一元二次方程x2﹣6x+2k=0有两个不相等的实数根,则实数k的取值范围是() A.B.C.D. 4.下列图形中,既是轴对称图形,又是中心对称图形的是() A.B.C.D. 5.某县2013年对教育的投入为2500万元,2015年对教育的投入为3500万元,求该县2013﹣2015年对教育投入的年平均增长率,假设该县投入教育经费的年平均增长率为x,则依题意所列方程正确的是() A.2500x2=3500 B.2500(1+x)2=3500 C.2500(1+x%)2=3500 D.2500(1+x)+2500(1+x)2=3500 6.如图,已知⊙O的直径CD=10cm,AB是⊙O的弦,AB=8cm,且AB⊥CD,垂足为M,则AC 的长度为() A.4cm B.3cm C.2cm D.cm 7.如图,扇形AOB的半径为1,∠AOB=90°,连接AB,则图中阴影部分的面积为()

A.B.C.D. 8.如图,△ABC的顶点A、B、C均在⊙O上,若∠ABC+∠AOC=90°,则∠ABC的大小是() A.30°B.45°C.60°D.70° 9.已知二次函数y=ax2+bx+c的图象如图所示,下列结论中,正确的是() A.a>0,b<0,c>0 B.a<0,b<0,c>0 C.a<0,b>0,c<0 D.a<0,b>0,c>0 10.二次函数y=ax2+bx+c(a≠0)的大致图象如图,关于该二次函数,下列说法错误的是() A.函数有最小值 B.对称轴是直线x= C.当x<时,y随x的增大而减小 D.当﹣1<x<3时,y>0 11.一个袋子中装有6个黑球3个白球,这些球除颜色外,形状、大小、质地等完全相同,在看不到球的条件下,随机地从这个袋子中摸出一个球,摸到白球的概率为() A.B.C.D. 12.如图,是张老师出门散步时离家的距离y与时间x之间的函数关系的图象,若用黑点表示张老师家的位置,则张老师散步行走的路线可能是() A.B.C.D.

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