初二上学期数学复习提纲

要单元制的人教版的
2024-12-16 10:04:21
推荐回答(3个)
回答1:

自己去书店买一本好了

回答2:

去书店喽,这还用问吗?

回答3:

一次函数

一、选择题(每小题5分,共30分)
1.(04镇江中考)已知abc≠0,并且 则直线 一定经过( )
A.第一、三象限 B、第二、三象限 C.第三、四象限 D、第一、四象限
2.(12届江苏)无论k为何值,一次函数(2k-1)x-(k-3)y-(k-11)=0的图像必经过定点( )
A.(0,0) B.(0,11) C.(2,3) D.无法确定
3.(05黑龙江竞赛题)已知正比例函数y=(2m-1)x的图像上有两点A(x1,y1),B(x2,y2),当x1<x2时,有y1>y2,那么m的取值范围是( )
A.m<2 B. m>2 C. m< D. m>
4.(广西)如右图是函数y=x的图像,设点P关于x轴的对称点P’在y=x上,如果P点的横坐标为2.5,那么P’的纵坐标为( )
A.2.5 B. -2.5 C. -1 D. -0.5
5.(18届江苏)在直角坐标系中,若一点的纵、横坐标都是整数,则称该点为整点,设k为整数,当直线y=x-2与y= kx +k的交点为整点时,k的值可取( )
A. 4个 B. 5个 C. 6个 D. 7个
6.(04黄冈中考)某班同学在探究弹簧的长度与外力的变化关系时,实验得到相应数据如下表:
砝码的质量x(克) 0 50 100 150 200 250 300 400 500
指针位置y(厘米) 2 3 4 5 6 7 7.5 7.5 7.5
则y与x的函数图像是( )

A B C D

二、填空题(每小题6分,共30分)
7.(05黑龙江)一次函数y=kx+2图像与x轴交点到原点的距离为4,那么k的值为_____。
8.(04呼和浩特)一次函数y= kx +b中,y随x的增大而减小,且kb>0,则这个函数的图像必定经过第__________象限。
9.(江苏省竞赛题)已知一次函数y= kx + b, kb<0,则这样的一次函数的图像必经过的公共象限有_____ 个,即第________象限。
10.(04无锡) 点A为直线y=-2x+2上一点,点A到两坐标轴距离相等,则点A的坐标为_________。
11.(05天津)若正比例函数y=kx与y=2x的图像关于x轴轴对称,则k的值等于_______。

三、解答题(每小题10分,共40分)
12、 已知A(-2,3),B(3,1),P点在x轴上,且│PA│+│PB│最小,求点P的坐标。

13、A单位有10人和B单位x人组成一个旅游团去某地旅游,甲旅行社的收费标准是:如果买12张全票,则其余半价优惠;乙旅行社的收费标准是:旅游团购团体票,按原价的70%优惠,这两家旅行社的每张票原价是300元。
(1)分别写出旅游团到甲、乙旅行社购票的总费用y(元)与x的函数关系式。
(2)你认为选择哪家旅行社更优惠?

14、(05江西中考)如图,直线L1、L2相交于点A,L1与x轴的交点坐标为(-1,0),L2与y轴的交点坐标为(0,-2),结合图像解答下列问题:
(1)求出直线L2表示的一次函数的表达式;
(2)当x为何值时,L1、L2表示的两个一次函数的函数值都大于0?

15、(黄石市应用能力测试题)新中国成立以来,东西部经济发展大致经历了两个阶段:第一阶段是建国初期到1980年,这阶段东西部的经济差距逐步缩小;第二阶段是1980年到1998年,这期间,由于各种原因,东西部的经济差距逐步拉大,仅就农民人均年收入的差距来看,下表可以说明:

年份 1978年 1980年 1998年
东西部农民年收入差额(元) 2000 0 2700
如果1980年到1998年东西部农民人均年收入差额每年增大值都相同,试根据表中有关数据,
(1)建立1980年至1998年东西部农民人均年收入差额y(元)随年份变化的函数关系式;
(2)请你推算出1990年东西部农民人均年收入差额

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