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精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023

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精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023
精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023
精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023
精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023
精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023
精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023
精品解析:北京师范大学三帆中学朝阳学校2022-2023学年八年级下学期期中数学试题(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_2022-2023

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2022-2023 学年北京师大三帆中学朝阳学校八年级(下)期中数学试 卷 一、选择题 1. 下列二次根式中,最简二次根式是( ) . A B. C. D. 2. 下列各组数中,能构成直角三角形的是( ) A. 4,5,6 B. 1,1,2 C. 6,8,10 D. 5,12,23 3. 下列曲线中,表示y是x的函数的是 ( ) A. B. C. D. 4. 如图,在矩形ABCD中,对角线AC,BD交于点O,若∠AOB=60°,BD=6,则AB的长为( ) . A B. 3 C. D. 2 5. 下列计算正确的是( ) A. B.C. D. 6. 如图,在 中, ,则 边上的高 的长为( ) A. 4 B. C. D. 5 7. 下列四组条件中,能判定四边形ABCD是平行四边形的有( ) ①AB=CD,AD=BC ②AB=CD,AB CD ③AB=CD,AD BC ④AB CD,AD BC A. ②③④ B. ①②④ C. ①②③ D. ①③④ 8. 已知,如图,正方形 中, , , 相交于点O,E,F分别为边 , 上的动 点(点E,F不与线段 , 的端点重合)且 ,连接 , , .在点E,F运动的 过程中,有下列四个结论: ① 始终是等腰直角三角形; ② 面积的最小值是 ; ③至少存在一个 .使得 的周长是 ; ④四边形 的面积始终是1. 所有正确结论的序号是( )A. ①②③④ B. ①②③ C. ①③④ D. ③④ 二、填空题 9. 若 在实数范围内有意义,则实数 的取值范围是_________. 10. 一个边长为a的正方形的面积与长为8,宽为18的矩形面积相等,则 _____. 11. 一木杆在离地面3m处折断,木杆顶端落在离木杆底端4m处,则木杆折断前有_______米. 12. 等边三角形的边长为2,则这个三角形的高的长是_________. 13. 如图,在直角 中, , , 是 的中点,则 的度数为______. 14. 写出一个在函数 图象上的点的坐标______. 15. 根据特殊四边形的定义,在如图的括号内填写相应的内容:_______16. 正方形 的顶点B,C都在平面直角坐标系的x轴上,若点A的坐标是 ,则点C的坐标为 _____. 17. 如图,在 中, 于 于 、 交于 ▱ 的延长线交于 ,给出下列结论:① ;② ;③ ;④ 若 平分 ,则 ;其中正确的结论有______ 填序号 三、解答题 . 18 计算: (1) (2) 19. 如图,在平行四边形 中,已知 , , 平分 交 边于点 , 求 的长度. 20. 用“描点法”画出函数 的图象. 解:函数 的自变量x的取值范围是 . x … 0 1 2 … y 判断 是否在函数 的图象上.21. 如图,矩形 中, ,E为 中点,F为 边上任意一点,G,H分别为 中点,求 的长. 22. 星期日晚饭后,小红从家里出去散步,如图所示,描述了她散步过程中离家的距离s(m)与散步所用 的时间t(min)之间的函数关系,该图象反映的过程是:小红从家出发,到了一个公共阅报栏,看了一会 报后,继续向前走了一段,在邮亭买了一本杂志,然后回家了.依据图象回答下列问题: (1)公共阅报栏离小红家有__________米,小红从家走到公共阅报栏用了__________分; (2)小红在公共阅报栏看新闻一共用了__________分; (3)邮亭离公共阅报栏有__________米,小红从公共阅报栏到邮亭用了__________分; (4)小红从邮亭走回家用了__________分,平均速度是__________米/分. 23. 是 的一条中位线,点E、F分别在 上, 的一条中线 与 交于O点,画图并证明: 与 互相平分. 24. 如图,将菱形 的边 和 分别延长至点E和点F,且使 , ,连接 , , , , . (1)求证:四边形 是矩形; 的 (2)若 , ,求 长. 25. 如图,在△ABC中,AB=BC,∠ABC=90°,D是线段AC上一点(AD>CD),连接BD,过点A作 BD的垂线,交BD于点E,交BC于点F. (1)依题意补全图形; 的 (2)若∠CAE= ,求∠CBD 大小(用含 的式子表示); (3)若点P在线段AF上,AP=BD,连接DP,BP, 用等式表示线段AB,BP,DP之间的数量关系,并 证明你的结论. 26. 阅读下面内容:我们已经学习了《二次根式》和《乘法公式》,聪明的你可以发现:当 , 时,∵ ,∴ ,当且仅当 时取等号.请利用上述结论解 决以下问题:(1)当 时, 的最小值为_______;当 时, 的最大值为__________. (2)当 时,求 的最小值. (3)如图,四边形ABCD的对角线AC ,BD相交于点O,△AOB、△COD的面积分别为4和9,求四边形 ABCD面积的最小值.
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  1. CONNECT:[ UseTime:0.000536s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000779s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000392s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000486s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000558s ]
  8. SELECT * FROM `wendang` WHERE `id` = 367355 LIMIT 1 [ RunTime:0.000431s ]
  9. UPDATE `wendang` SET `liulancishu` = 2 WHERE `id` = 367355 [ RunTime:0.012372s ]
  10. UPDATE `wendang` SET `lasttime` = 1773072514 WHERE `id` = 367355 [ RunTime:0.000555s ]
  11. SELECT * FROM `wendang` WHERE `id` < 367355 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000620s ]
  12. SELECT * FROM `wendang` WHERE `id` > 367355 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000581s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 367355 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001746s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 367355 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001521s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 367355 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005935s ]
0.097172s