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精品解析:北京市首都师范大学附属中学2023-2024学年八年级下学期开学考试数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京数学八下_2023-2024

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精品解析:北京市首都师范大学附属中学2023-2024学年八年级下学期开学考试数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京数学八下_2023-2024
精品解析:北京市首都师范大学附属中学2023-2024学年八年级下学期开学考试数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京数学八下_2023-2024
精品解析:北京市首都师范大学附属中学2023-2024学年八年级下学期开学考试数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京数学八下_2023-2024
精品解析:北京市首都师范大学附属中学2023-2024学年八年级下学期开学考试数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京数学八下_2023-2024
精品解析:北京市首都师范大学附属中学2023-2024学年八年级下学期开学考试数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京数学八下_2023-2024

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初二下数学开学适应性练习 一、选择题(每小题4分,共32分) 1. 下列各组数分别为一个三角形三边 的长,其中能构成直角三角形的一组是( ) A. 2,3,4 B. 6,8,10 C. 5,12,14 D. 1,1,2 2. 下列化简正确的是( ) A. B. C. D. 3. 如图,直线l上有三个正方形a,b,c,若a,c的面积分别为5和11,则b的面积为( ) A. 6 B. 5 C. 11 D. 16 4. 如图,一支铅笔放在圆柱体笔筒中,笔筒的内部底面直径是9cm,内壁高12cm,则这只铅笔的长度可 能是( ) . A 9cm B. 12cm C. 15cm D. 18cm 5. 下列命题的逆命题是真命题的为( ) A. 若 ,则 B. 如果 ,那么 C. 对顶角相等 D. 若 , ,则 的 6. 若 是整数,则满足条件 自然数n共有( )个 A. 1 B. 2 C. 3 D. 4 7. 甲、乙两艘客轮同时离开港口,航行的速度都是40m/min,甲客轮用15min到达点A,乙客轮用20min 到达点B,若A,B两点的直线距离为1000m,甲客轮沿着北偏东30°的方向航行,则乙客轮的航行方向可 能是( ) A. 北偏西30° B. 南偏西30° C. 南偏东60° D. 南偏西60° 第1页/共5页 学科网(北京)股份有限公司8. 船航行的海岸附近有暗礁,为了使船不触上暗礁,可以在暗礁的两侧建立两座灯塔.只要留心从船上到 两个灯塔间的角度不超过一定的大小,就不用担心触礁.如图所示的网格是正方形网格,点 是网格线交点,当船航行到点 的位置时,此时与两个灯塔 间的角度( 的大小)一定无触礁危险.那么,对于 四个位置,船处于___________时,也一定无触 礁危险.( ) A. 位置 B. 位置 C. 位置 D. 位置 二、填空题(每小题4分,共32分) 9. 已知二次根式满足条件“只含有字母x,且当 时有意义”,请写出一个这样的二次根式______. 10. 如图是某路口处草坪的一角,当行走路线是 时,有人为了抄近道而避开路的拐角 ,于是在草坪内走出了一条不该有的捷径路 .某学习实践小组通过测量可知, 的长 约为6米, 的长约为8米,为了提醒居民爱护草坪,他们想在 A, 处设立“踏破青白可惜,多行数 步无妨”的提示牌.则提示牌上的“多行数步”是指多行______米. 11. 已知 ,则 的平方根是______. 第2页/共5页 学科网(北京)股份有限公司12. 计算: ______; ______; ______. 13. 如图所示,某人到岛上去探宝,从A处登陆后先往东走 ,又往北走 ,遇到障碍后又往西走 ,再折回向北走到 处往东一拐,仅走 就找到宝藏.问登陆点A与宝藏埋藏点B之间的 距离是_________. 14. 如图,小正方形边长为1,连接小正方形的三个顶点,可得 ,则 边上的高是________. 15. 我国三国时期的杰出数学家赵爽在注解《周髀算经》时,巧妙地运用弦图证明了勾股定理.“赵爽弦 图”是由四个全等的直角三角形与中间的一个小正方形拼成的大正方形.若图中的直角三角形的两条直角 边分别是2和4,则中间小正方形的面积占大正方形面积的________. 16. 已知 中, ,若 , ,则 的面积为______. 三、解答题(共36分) 17. 明朝数学家程大位在他的著作《算法统宗》中写了一首计算秋千绳索长度的词《西江月》:“平地秋 第3页/共5页 学科网(北京)股份有限公司千未起,踏板一尺离地.送行二步恰竿齐,五尺板高离地…”翻译成现代文为:如图,秋千 静止的时 候,踏板离地高一尺( 尺),将它往前推进两步( 尺, 于 ),此时踏板升高 离地五尺( 尺),求秋千绳索( 或 )的长度. 的 18. 如图,四边形 中, ,过点A作 于点E,点E恰好是 中点,连接 , , , . (1)直接写出 的长为______; (2)求 的长. 19. 定义:在 ,若 , , ,a,b,c满足 则称这个三角形为“和 谐勾股三角形”.请根据以上定义解决下列问题: (1)命题:“直角三角形都是和谐勾股三角形”是 (填“真”或“假”)命题; (2)如图1,若等腰 是“和谐勾股三角形”,其中 , ,求 的度数; (3)如图2,在三角形 中, ,且 . 第4页/共5页 学科网(北京)股份有限公司①当 时,你能把这个三角形分成两个等腰三角形吗?若能,请在图2中画出分割线,并标注被 分割后 的两个等腰三角形的顶角度数;若不能,请说明理由; ②请证明 为“和谐勾股三角形” 20. 如图,在 中, ,过点A作 且 ,点D与点B在 的两侧,连 接 . (1)依题意补全图形; (2)用等式表示 之间的数量关系,并证明. 第5页/共5页 学科网(北京)股份有限公司
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  1. CONNECT:[ UseTime:0.000421s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000568s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000797s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000450s ]
  6. SELECT * FROM `set` [ RunTime:0.000186s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000682s ]
  8. SELECT * FROM `wendang` WHERE `id` = 367310 LIMIT 1 [ RunTime:0.003010s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 367310 [ RunTime:0.007429s ]
  10. UPDATE `wendang` SET `lasttime` = 1773066415 WHERE `id` = 367310 [ RunTime:0.000438s ]
  11. SELECT * FROM `wendang` WHERE `id` < 367310 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000479s ]
  12. SELECT * FROM `wendang` WHERE `id` > 367310 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000350s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 367310 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002660s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 367310 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002137s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 367310 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009372s ]
0.115534s