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    陕西省咸阳市兴平市2022-2023学年八年级上学期阶段性自测数学试题(含答案)

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    陕西省咸阳市兴平市2022-2023学年八年级上学期阶段性自测数学试题(含答案)

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    这是一份陕西省咸阳市兴平市2022-2023学年八年级上学期阶段性自测数学试题(含答案),共11页。试卷主要包含了本试卷共8页,满分120分;,估计的值在,化简等内容,欢迎下载使用。


    绝密启用前

    2022—2023学年度第一学期阶段性自测题

    八年级数学北师大版

    老师真诚地提醒你

    1本试卷共8页,满分120

    2答卷前请将密封线内的项目填写清楚;

    3书写要认真、工整、规范;卷面干净、整洁、美观

    第一部分选择题 24

    一、选择题8小题,每小题3分,计24每小题只有一个选项是符合题意的,请将正确答案的序号填在题前的答题栏中

    1计算   

    A B8 C D4

    2一辆汽车以每时60千米的速度匀速行驶,行驶的路程随时间的变化而变化,在这辆汽车行驶过程中,因变量是   

    A路程 B速度 C时间 D汽车的质量

    3下列各组长度的线段,可以作为直角三角形三条边的是   

    A1cm3cm4cm  B9cm12cm15cm

    C6cm8cm9cm  D4cm6cmcm

    4在平面直角坐标中,点与点关于x轴对称,则点所在的象限是   

    A第一象限 B第二象限 C第三象限 D第四象限

    5估计的值在   

    A23之间 B34之间 C45之间 D56之间

    6一次函数和正比例函数在同一直角坐标系中的图象可能是   

    A B C D

    7如图,所有阴影部分的四边形都是正方形,所有三角形都是直角三角形,若正方形ABC的面积依次为486,则正方形D的面积为   

    A10 B12 C16 D18

    8如图,是直角三角形,点C在数轴上对应的数为,目,若以点C为圆心,为半径画弧交数轴于点M,则AM两点间的距离为   

    A0.4 B C D

    第二部分非选择题 96

    二、填空题5小题,每小题3分,计15

    9化简________

    10在平面直角坐标系中,将点先向左平移2个单位长度,再向上平移4个单位长度,得到点B,则点B的坐标为________

    11根据下表中的数据写出yx之间的一个关系式________

    x

    0

    1

    2

    3

    y

    1

    0

    12现定义一个新运算“※”,规定对于任意实数xy,都有,则的值为________

    13如图,点D内,,则图中阴影部分的面积为________

    三、解答题13小题,计81分,解答应写出过程

    14.(本题满分5

    计算

    15.(本题满分5

    陕西某旅游景点的门票收费标准是每人30某公司计划组织员工去该景点旅游,写出总门票费y与人数x之间关系式,并判断yx的正比例函数吗?

    16.(本题满分5

    李叔叔将8个正方体魔方,放入到一个容积为512的正方体纸箱中,恰好填满求这个魔方的棱长

    17.(本题满分5

    已知平面直角坐标系内有一点,根据下列条件分别求出相应的点M的坐标

    1Mx轴的距离为3

    2N的坐标为,且直线

    18.(本题满分5

    如图,将直线向上平移2个单位,得到一个一次函数的图象,求这个一次函数的表达式

    19.(本题满分5

    如图,正方形网格中的每个小方格边长均为1的顶点在格点上,判断的形状,并说明理由

    20.(本题满分5

    在下面的平面直角坐标系中画出一次函数的图象,并判断点是否在该函数的图象上

    21.(本题满分6

    为了更好的开展古树名木的系统保护工作,某公园对园内的6棵百年古树都利用坐标确定了位置,并且定期巡视

    1在如图所示的正方形网格中建立平面直角坐标系,使得古树AB的位置分别表示为

    21建立的平面直角坐标系

    表示古树C的位置的坐标为________

    标出古树的位置

    22.(本题满分7

    已知的算术平方根是2的立方根是3c的整数部分,求的平方根

    23.(本题满分7

    如图,一根直立的旗杆高8m,因刮大风旗杆从点C处折断,顶部B着地且离旗杆底部A的距离为4m

    1求旗杆距地面多高处折断

    2工人在修复的过程中,发现在折断点C的下方1m的点D处,有一条明显裂痕,将旗杆修复后,若下次大风将旗杆从点D处吹断,则距离旗杆底部周围多大范围内有被砸伤的风险?

    24.(本题满分8

    某桶装水销售部每天的房租、人员工资等固定成本为200元,每桶水的进价是5现在每桶水的销售价格为8元,如果用x单位表示每天的销售数量,用y表示每天的利润.(利润=总销售额-固定成本-售出水的成本

    1试写出yx的函数关系式;

    2如果某天的销售数量是260桶,那么这天的利润是多少元?

    3若某天的利润是730元,那么这天销售了多少桶水?

    25.(本题满分8

    先观察下列的计算,再完成练习

    1

    2

    3

    请你分析、归纳上面的解题方式,解决如下问题

    1化简

    2已知n是正整数,求的值

    3计算

    26.(本题满分10

    如图,直线经过原点O,点Ax轴上于点D于点F,已知点,求的长度

    绝密启用前

    2022—2023学年度第一学期阶段性自测题

    八年级数学参考答案及评分标准(北师大版)

    一、选择题(共8小题,每小题3分,计24分)

    题号

    1

    2

    3

    4

    5

    6

    7

    8

    答案

    D

    A

    B

    C

    B

    A

    D

    C

    二、填空题(共5小题,每小题3分,计15分)

    9      10      11      128      13

    三、解答题(共13小题,计81分.解答应写出过程)

    14.(本题满分5分)

    解:原式···············································································2

    ······················································································4

    ····················································································5

    15.(本题满分5分)

    解:总门票费y(元)与人数x(人)之间关系式为:············································3

    yx的正比例函数.······································································5

    16.(本题满分5分)

    解:1个魔方的体积为:··································································2

    这个魔方的棱长为cm).

    答:这个魔方的棱长为4cm································································5

    17.(本题满分5分)

    解:(1)因为Mx轴的距离为3

    解得···············································································1

    时,点M坐标为

    时,点M坐标为

    所以满足条件的点M坐标为······························································3

    2)因为直线轴,

    所以

    解得·················································································4

    所以点M坐标为········································································5

    18.(本题满分5分)

    解:因为直线经过原点和点

    所以设直线的表达式为

    将点代入中,得

    解得·················································································2

    所以直线的表达式为····································································3

    所以将直线向上平移2个单位得到的一次函数的表达式为·········································5

    19.(本题满分5分)

    解:是直角三角形.······································································1

    理由:由勾股定理,得···································································2

    ····················································································3

    ····················································································4

    因为

    所以

    所以是直角三角形.······································································5

    20.(本题满分5分)

    解:当时,

    时,

    所以该图象经过点和点

    一次函数在平面直角坐标系中的图象如图.

    ······················································································3

    时,

    所以点不在该函数图象上.·································································5

    21.(本题满分6分)

    解:(1)建立的平面直角坐标系如图;·······················································2

    2··············································································3

    古树DEF的位置如图.·······························································6

    22.(本题满分7分)

    解:因为的算术平方根是2的立方根是3

    所以

    解得···············································································2

    因为

    所以

    所以的整数部分是3

    所以·················································································4

    所以

    所以的平方根是········································································7

    23.(本题满分7分)

    解:(1)由题意,知

    因为

    长为,则

    ··················································································2

    解得

    故旗杆距地面3米处折断;··································································3

    2)如图.

    因为点D距地面········································································4

    所以·················································································5

    所以

    所以距离旗杆底部周围米的范围内有被砸伤的风险.··············································7

    24.(本题满分8分)

    解:(1yx的函数关系式为:···························································3

    2)当时,(元),

    答:那么这天的利润是580元;······························································5

    3

    解得

    答:那么这天销售了310桶水.······························································8

    25.(本题满分8分)

    解:(1)原式·········································································2

    2················································································5

    3)原式··············································································7

    ····················································································8

    26.(本题满分10分)

    解:如图,过C轴于点G

    因为点

    所以·············································································1

    所以·················································································3

    由题意,得··········································································5

    因为,所以是直角三角形,

    所以·················································································6

    因为

    所以

    所以·················································································8

    所以

    解得

    所以···············································································10


     

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