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relationship, established equivalent relationship 14, and subject: application problem (4)--scores and percentage application problem review content overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units \ssociate %ume rate corresponds to\onship, Then in-line solution. Category fraction multiplication word problem score Division applications engineering problem problem XV, a subject: review of the measurement of the amount of capacity, measurement and units of measurement of common units of measurement and their signce in rate s slightly solid 1, currency, length, area, volume, ume 1, size 2, table ...unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Zhijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)--line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry preliminary knowledge (2)--plane graphics review content triangle, and edges nd ashaped, and round, and fan axisymmetric graphics perimeter and area combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divided into: cuboid, square 3, cone cone of the features of cuboids and cubes relationship between characteristics nificaof circular cone isurface area and vol和第一学期初二期末学业水平检测数学试卷一

一、选择题． 1．在

22，8，-3．1416，?，25，0．……，39中无理数有（ ） 7

B．3个

C．4个

D．5个

A．2个

2．下列说法错误的是（ ）

A．1是(?1)2的算术平方根 C．-27的立方根是-3

B．144??12

2D．(?7)?7

3．下列三角形一定不是直角三角形的是（ ）

A．一个内角等于另外两个内角之和 C．三边长分别为7，24，25

B．三个内角之比为3：4：5 D．三边之比为5：12：l3

4．如图，点P是∠BAC的平分线AD上一点，且∠BAC=30°，PE∥AB交AC于点E，已知AE=2，则点P到AB的距离是（ ）

A．1．5

B．3 C．1

D．2

5．根据下列表述，能确定位置的是（ ） A．国家大剧院2排

C．北偏东30°

B．莱州市立交桥北 D．东经117°，北纬42°

6．已知等腰直角三角形ABC，斜边AB的长为2．以AB所在直线为x轴，AB的垂直平分线为y轴建立直角坐标系，则点C的坐标是（ ）

A．（0，1） B．（0，-l） C．（0，1）或（0，-l） D．（1，0）或（-1，0） 7．一次函数y?mx?n与正比例函数y?mnx （m、n为常数mn?0）图象可以是下图中的（ ）

A

B

C

D

8．小亮用作图象的方法解二元一次方程组时，在同一直角坐标系内作出了相应的两个一次函数的图象，交点为A（2，-2），如图，他解的这个方程组是（ ）

relationship, established equivalent relationship 14, and subject: application problem (4)--scores and percentage application problem review content overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units \ssociate %ume rate corresponds to\onship, Then in-line solution. Category fraction multiplication word problem score Division applications engineering problem problem XV, a subject: review of the measurement of the amount of capacity, measurement and units of measurement of common units of measurement and their signce in rate s slightly solid 1, currency, lesurface area and volngth, area, volume, ume 1, size 2, table ...unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Zhijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)--line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry preliminary knowledge (2)--plane graphics review content triangle, and edges nd ashaped, and round, and fan axisymmetric graphics perimeter and area combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divided into: cuboid, square 3, cone cone of the features of cuboids and cubes relationship between characteristics nificaof circular cone i和?y??2x?2?y??2x?2?y?3x?8y??2x?2???A．? B．?C． D．? 1?1?1y?x?1y??x?1y?x?3?y??x???2?2?2?9．如图1，在矩形MNPQ中，动点R从点N出发，沿N→P→Q→M方向运动至点M处停止．设点R运动的路程为x，△MNR的面积为y，如果y关于x的函数图象如图2所示，则当x=9时，点R应运动到 （ ） A．Q处 B．P处 C．N处 D．M处

10．小强拿了一张正方形的纸如图（1），沿虚线对折一次得图（2），再对折一次得图（3），然后用剪刀沿图（3）中的虚线（虚线与底边平行）剪去一个角，再打开后的形状应是

A

B

C

D

二、填空题：

11．若一个数的算术平方根是8，则这个数的立方根是_______．

?x?212．写出一个解为?的二元一次方程组______________．

y??1?13．在△ABC中，AB=AC，AB的中垂线与AC所在直线相交所得的锐角为50°，则底角∠B的大小为________________．

14．点（-4，y1）、（2，y2）都在直线y??3x?b上，则y1_y2 （填“>，“=”，“<”）． 15．若点A（b，4-b）与点B（a?2，a）关于原点对称，则a=____，b=______． 16．从一副完整的扑克牌中任意抽取一张，牌面是梅花并且数字小于10的概率是_______． 17．已知一次函数y?kx?b的图象（如图），当x?0时，y的取值范围是______． 18．已知一次函数y?mx?2的图象与两坐标轴围成的三角形的面积为1，则常数

m?__．

19．我国目前严重缺水，大家都应加倍珍惜水资源，节约用水，据测试，拧不紧的水龙头每秒钟滴下2滴水，每滴水约0．05毫升，小明同学洗手时，没有把水龙头拧

relationship, established equivalent relationship 14, and subject: application problem (4)--scores and percentage application problem review content overview answers scores, and percentage application problem of key is: according to meaning, (1) determine standard volume (units \ssociate %ume rate corresponds to\p, Then in-line solution. Category fraction multiplication word problem score Division applications engineering problem problem XV, a subject: review of the measurement of the amount of capacity, measurement and units of measuremeof measurement and their significance in rate s slightly solid 1, currency, length, area, volume, unit size, volume, weight and rate. (Omitted) 2, commonly used time units and their relationships. (Slightly) with a measurement units Zhijian of of poly 1, and of method 2, and poly method 3, and of method and poly method of relationship measurement distance of method 1, and tool measurement 2, and estimates 16, and subject: geometry preliminary knowledge (1)--line and angle review content line, and segment, and Ray, and vertical, and parallel, and angle angle of classification (slightly) 17, and subject: geometry preliminary knowledge (2)--plane graphics review content triangle, and edges nd ashaped, and round, and fan axisymmetric graphionshics perimeter and area combination graphics of area subject : Preliminary knowledge (3)-review of solid content category 1-d shapes are divided into: cylinder and cone 2, column is divided into: cuboid, square 3, cone cone of the features of cuboint of common units ds and cubes relationship between characteristics of circular cone isurface area and volume 1, size 2, table ...和紧当小明离开x小时后，水龙头滴y毫升的水，试写出y关于x的函数关系式__________ 20．如图，长方形ABCD中，AB=3cm，AD=9cm，将此长方形折叠，使点B与点D重合，拆痕为EF，则重叠部分△DEF的边ED的长是_______cm． 三、完成下列各题： 21．计算：3

23．一青蛙在如图所示6×6的正方形（个小正方形的边长为l）网格的格点上跳跃，青蛙每次所跳的最远距离为5，青蛙从点A开始连续跳六次正好跳回到点A，并且围成了一个面积最大的图形． （1）画出示意图；

（2）直接写出所围成的图形的面积．

24．某中学为改善教学条件计划购买一批多媒体电脑，表中握腾达电脯公司提供的报价单．该中学要从甲、乙两种品牌电脑中各选购一种型号的电脑．

（1）写出所有选购方案（用字母组合表示）；

（2）如果（1）中各种选购方案被选中的可能性相同，那么A型号电脑被选中的概率是多少?

（3）现知该中学购买了甲、乙两种品牌电脑共40台，恰好用了l0万元人民币．其中甲品牌电脑为A型号，求购买的A型号电脑有几台?

乙 E 2 000 甲 腾达电脑公司报价单 品牌 型号 单价（元） A B C D 6 000 4 000 2 500 5 000 ?4?50%x?75%?134312解方程组：? ???(?2)22．

0.1x?0.3y??0.7273?3