最新中考数学试题按知识点分类汇编二次函数和抛物线概念、描点法画二次函数图象、顶点和对称轴优秀名师资料

2008年中考数学试题按知识点分类汇编(二次函数和抛物线概念、描点法画二次函数图象、顶点和对称轴)

知识点:二次函数和抛物线有关概念，描点法画出二次函数的图象，抛物线顶点和对称轴

一、选择题

1.(2008年浙江省衢州市)把抛物线向右平移2个单位得到的抛物线是( ) A、

B、 C、 D、答案:D

2((08浙江温州)抛物线的对称轴是( )

A(直线 B(直线 C(直线

D(直线

答案:A

3.(2008年沈阳市)二次函数的图象的顶点坐标是( ) A( B( C( D(

答案:A

4.(2008年陕西省)已知二次函数(其中)，关于这个二次函数的图象有如下说法:?图象的开口一定向上;?图象的顶点一定在第四象限;?图象与轴的交点至少有一个在轴的右侧(以上说法正确的个数为( ) A(0 B(1 C(2 D(3

答案:C

5.(2008年吉林省长春市)抛物线的顶点坐标是【】

A.(,2，3)

B.(2，3)

C.(,2，,3)

D.(2，,3) 答案:A

6.(2008 湖北荆门)把抛物线y=x+bx+c的图象向右平移3个单位，再向下平

移2个单位，所得图象的解析式为y=x,3x，5，则 ( )

(A) b=3,c=7( (B) b=6,c=3( (C) b=,9,c=,5( (D) b=,9,c=21( 答案:A

7.(2008 河北)如图，正方形的边长为10，四个全等的小正方形的对称中心分

别在正方形的顶点上，且它们的各边与正方形各边平行或垂直(若小正方形的边长为，且，阴影部分的面积为，则能反映与之间函数关系的大致图象是( )

standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for

steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded tank code for construction and acceptance of 3 JB/ T4735-1997 steel welded atmospheric

pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine

of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge

答案:D

8((2008江西)函数化成的形式是( ) A( B(C( D(

答案:A

9.(2008佳木斯市)对于抛物线，下列说法正确的是( ) A(开口向下，顶点坐标

B(开口向上，顶点坐标

C(开口向下，顶点坐标 D(开口向上，顶点坐标答案:A