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【免费下载】精编江苏省苏州市吴江区吴江区铜罗中学20222023学年八年级下学期5月月考数学试题

  • 2026-11-06 01:56:44
【免费下载】精编江苏省苏州市吴江区吴江区铜罗中学20222023学年八年级下学期5月月考数学试题

学年第二学期阶段测试题

初二数学

一、选择题(本大题共10小题,每小题2分,共20分,请把答案直接填写在答卷纸相应位置上)

1. 若分式的值为零,则x等于(  )

A. 0B. 2C. D. 

【答案】C

【解析】

【分析】分式有意义时,分母不为零;分式的值为零时,分子等于零,据此可得,求解即可.

【详解】∵分式的值为零,

∴

解得

故选:C.

【点睛】本题考查了分式的值为零时的条件,熟练掌握分式的值为0的条件是解题的关键.

2. 下列各根式中与是同类二次根式的是(  )

A. B. C. D. 

【答案】C

【解析】

【分析】把几个二次根式化为最简二次根式后,如果它们的被开方数相同,就把这几个二次根式叫做同类二次根式,据此作答即可.

【详解】A.,不与是同类二次根式;

B. ,不与是同类二次根式;

C. ,与是同类二次根式;

D. ,不与是同类二次根式;

故选:C.

【点睛】本题考查了同类二次根式的定义,化简二次根式,熟练掌握知识点是解题的关键.

3. 下列所述图形中,是中心对称图形的是()

A. 直角三角形B. 平行四边形C. 正五边形D. 正三角形

【答案】B

【解析】

【详解】解:A、直角三角形不是中心对称图形,故本选项不符合题意;

B、平行四边形是中心对称图形,故本选项符合题意;

C、正五边形不是中心对称图形,故本选项不符合题意;

D、正三角形不是中心对称图形,故本选项不符合题意.

故选B.

4. 如图中是实数a、b在数轴上的对应点的位置,化简的结果是()

A. B. C. D. 

【答案】D

【解析】

【分析】根据数轴上点的位置确定出a+b与a-b的正负,原式利用二次根式性质及绝对值的代数意义化简即可求出值.

【详解】解:根据数轴上点的位置得:a<0<b,

∴a+b<0,a-b<0,

∴

故答案为:D.

【点睛】此题考查了二次根式的性质与化简,以及实数与数轴,熟练掌握各自的性质是解本题的关键.

5. 小明的书包里只装有外观相同的作业本,其中语文作业本4本,数学作业本5本,英语作业本3本.小明从书包中随机抽出一本,不是数学作业本的概率是(  )

A. B. C. D. 

【答案】D

【解析】

【分析】先求出书的总量,再求出不是数学作业本的数量,最后根据概率公式求解即可.

【详解】∵语文作业本4本,数学作业本5本,英语作业本3本,

∴共有本,不是数学作业本的有7本,

∴小明从书包中随机抽出一本,不是数学作业本的概率是

故选:D.

【点睛】本题考查了概率公式的应用,掌握概率等于所求情况数与总情况数之比是解题的关键.

6. 在函数(为常数)的图象上有三点,则函数值的大小关系是

A. B. C. D. 

【答案】D

【解析】

【分析】根据反比例函数的性质得到函数图象在第一、三象限,结合函数增减性,根据所给点的位置判断即可.

【详解】解:中

函数图象在第一、三象限,即在每一个象限中随的增大而减小,

在第三象限,

,

在第一象限,

综上所述:,

故选:D.

【点睛】本题主要考查对反比例函数的性质,反比例函数图象上点的坐标特征等知识点的理解和掌握,能熟练地根据性质进行说理是解此题的关键.

7. 下列五幅图均是由边长为1的16个小正方形组成的正方形网格,网格中的三角形的顶点都在小正方形的顶点上,那么在下列右边四幅图中的三角形,与左图中的△ABC相似的个数有()

A. 1个B. 2个C. 3个D. 4个

【答案】B

【解析】

【分析】可利用正方形的边把对应的线段表示出来,利用三边对应成比例两个三角形相似,分别计算各边的长度即可解题.

【详解】解:根据题意得:

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  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000438s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000372s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000585s ]
  6. SELECT * FROM `set` [ RunTime:0.000330s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000646s ]
  8. SELECT * FROM `article` WHERE `id` = 469226 LIMIT 1 [ RunTime:0.000480s ]
  9. UPDATE `article` SET `lasttime` = 1793905239 WHERE `id` = 469226 [ RunTime:0.001937s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000355s ]
  11. SELECT * FROM `article` WHERE `id` < 469226 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000514s ]
  12. SELECT * FROM `article` WHERE `id` > 469226 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000446s ]
  13. SELECT * FROM `article` WHERE `id` < 469226 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000849s ]
  14. SELECT * FROM `article` WHERE `id` < 469226 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000708s ]
  15. SELECT * FROM `article` WHERE `id` < 469226 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000706s ]
0.085993s