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江西省九年级中考数学模拟冲刺试卷六

  • 2026-06-16 21:49:40
江西省九年级中考数学模拟冲刺试卷六

江西省九年级中考数学模拟冲刺试卷六

班级: __________ 姓名: __________满分: 120分 作业时间: 120分钟


一、选择题(本大题共6小题,每小题3分,共18分每小题。只有一个正确选项。)

  1. 若顺时针旋转为负,则逆时针旋转  可记作 (   )A. B. C. D. 

  2. 下列事件是随机事件的是 ( )A. 任意画一个三角形,三角形的内角和为 B. 明天的太阳从西方升起C. 经过有交通信号灯的路口,遇到红灯D. 已知图形序列🌜 ★●🌞🌞🌜★●🌞🌞……,则第23个图形是●

  3. 计算:  (   )A. B. C. D. 

  4. 如图,这个立体图的俯视图是(  )

  5. 如图,在矩形  中,,将矩形  绕着点  顺时针旋转得到矩形 ,当点  落在边  上时,连接 ,则  (  )A. B. C. D. 

  6. 抛物线  () 经过点 ,点 ,且与  轴交于点 ,给出下列结论: ① 该抛物线的对称轴为直线 ; ② ; ③ 当  时,点  的纵坐标等于 ; ④ 对于任何实数 ,总有 。 其中正确结论的个数是 (   )A. 1B. 2C. 3D. 4


二、填空题(本大题共6小题,每小题3分,共18分)

  1. 若  在实数范围内有意义,则实数  的值可以是 ________。

  2. 在平面直角坐标系  中,将函数  的图象先向左平移5个单位长度,再向上平移6个单位长度后,得到的图象的函数解析式是 ________。

  3. 若关于  的一元二次方程  有两个相等的实数根,则  的值为 ________。

  4. 如图, 与  位似,位似中心是点  的面积为9,则  的面积是 ________。

  5. 甲做180个娃娃与乙做420个娃娃所用的时间相同,已知两人每天共做100个娃娃,若设甲每天做  个娃娃,则可列方程为 ________。

  6. 在  中,,点  在边  上,点  在边  上,且 ,若  为等腰三角形,则  的长为 ________。


三、解答题(本大题共5小题,每小题6分,共30分)

  1. (1) 计算: 

     (2) 如图,已知点  在  的边  上,作  交  于点  交  于点  平分 ,求  的面积。

  2. 解不等式组

    请结合题意填空,完成本题的解答。 (1) 解不等式①,得 ________; (2) 解不等式②,得 ________; 

    (3) 把不等式①和②的解集在数轴上表示出来;

     (4) 原不等式组的解集为 ________。

  3. 劳动课上,李老师准备了四张卡片,正面分别写有四种劳动技能的编号和名称:A.烹饪、B.园艺、C.木工、D.清洁。李老师将卡片背面朝上洗匀后,请甲、乙两位同学分别抽取一张卡片(抽后放回),并根据卡片上的技能名称回答相关问题。 (1) 甲同学抽到编号为“B”的卡片的概率是 ________; (2) 请用画树状图或列表的方法,求甲、乙两位同学抽到的卡片相同的概率。

  4. 某校为美化校园,计划购进A,B两种花苗。已知在相同时间内,5株A种花苗和3株B种花苗的施肥量共为240g,且每株A种花苗的施肥量比每株B种花苗多8g。求每株A种花苗和每株B种花苗的施肥量各是多少克?

  5. 如图,在四边形  中,,点  为  的中点,连接 ,请仅用无刻度的直尺分别按下面的要求作图(保留作图痕迹,但不要求写作法)。 (1) 在图1中,画出  的边  上的中点 ; (2) 在图2中,画出  的边  上的中点 


四、解答题(本大题共3小题,每小题8分,共24分)

  1. 如图,正比例函数  的图象与反比例函数  () 的图象的一个交点是点 。点  在直线  上,点  在正比例函数图象上,其中 ,过点  作  轴的平行线,交  的图象于点 ,连接 。 (1) 求  的值; (2) 求  的面积。

  2. “浔阳江头夜送客,枫叶荻花秋瑟瑟”。小明学习了平面镜成像原理后,利用这一原理验证浔阳楼  的高度,在水平面  的点  处放一平面镜 ( 为法线),小红站在点  处 ( 为眼睛到脚底的高度)恰好能看到浔阳楼最高点  处,测得 。 (参考数据:) (1) 求  之间的距离; (2) 求浔阳楼  的高度。

  3. 如图, 为  的直径,点  为  上一点,过点  作  的切线 ,交  的延长线于点  于点 ,交  于点 ,连接 。 (1) 求证: 平分 ; (2) 若 ,求  的半径。


五、解答题(本大题共2小题,每小题9分,共18分)

  1. 【项目背景】视力是衡量学生眼睛健康的重要指标。某中学随机抽取八年级20名学生(男生10名,女生10名),检测他们的视力值。【收集、整理数据】
  • 男生视力: 0.12, 0.15, 0.2, 0.25, 0.25, 0.3, 0.6, 0.6, 0.6, 1.2
  • 女生视力: 0.2, 0.2, 0.25, 0.25, 0.3, 0.3, 0.3, 0.6, 0.8, 1.2
    下面是八年级学生视力等级评价表:
    【描述、分析数据】
    抽取的20名学生的视力值统计表
    【问题解决】(1) 补全视力值统计表;
     (2) 根据等级评价表,分别计算男生和女生的视力正常率;
     (3) 小华说:“从平均数看,男生的视力比女生好。”小红说:“从中位数看,女生的视力比男生好。”你认为他们谁的说法合理?请说明理由;
     (4) 该校八年级共有200名学生。根据本次抽测结果,估计该校八年级视力等级为“低度近视”及“正常”的学生共有多少人?
  1. 在平面直角坐标系  中,点  的横坐标分别为 ,二次函数  的图象经过点 ,且  满足  ( 为常数)。 (1) 若一次函数  的图象经过  两点。 ① 当  时,求  的值; ② 若  随  的增大而增大,求  的取值范围; (2) 点  的位置随着  的变化而变化,设点  运动的路线与  轴分别相交于点 ,线段  的长度会发生变化吗?如果不变,求出  的长;如果变化,请说明理由。

六、解答题(本大题共12分)

  1. 【模型迁移】(1) 如图1, 都是等腰直角三角形,分别连接 ,试猜想  与  的数量关系,并证明;
    【特殊感知】(2) 在(1)的条件下,若 ,求  的长;
    【类比应用】(3) 如图2,在四边形  中,,求  的长。

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  1. CONNECT:[ UseTime:0.000683s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000884s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000316s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000537s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000576s ]
  8. SELECT * FROM `article` WHERE `id` = 502070 LIMIT 1 [ RunTime:0.000545s ]
  9. UPDATE `article` SET `lasttime` = 1781704649 WHERE `id` = 502070 [ RunTime:0.000875s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000239s ]
  11. SELECT * FROM `article` WHERE `id` < 502070 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000451s ]
  12. SELECT * FROM `article` WHERE `id` > 502070 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006853s ]
  13. SELECT * FROM `article` WHERE `id` < 502070 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002640s ]
  14. SELECT * FROM `article` WHERE `id` < 502070 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004520s ]
  15. SELECT * FROM `article` WHERE `id` < 502070 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000992s ]
0.091412s