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精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021

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精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021
精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021
精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021
精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021
精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021
精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021
精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021
精品解析:北京市顺义区2020-2021学年九年级上学期期末数学试题(原卷版)(1)_北京初中期末题_C605-京七八九_B京市数学七八九_北京9上数学_2020-2021

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顺义区 2020——2021 学年度第一学期期末九年级教学质量检测 数学试卷 考生须知: 1.本试卷共6页,共三道大题,25道小题,满分100分.考试时间120分钟. 2.在试卷和答题纸上准确填写学校名称、班级、姓名和准考证号. 3.试题答案一律填涂或书写在答题纸上,在试卷上作答无效. 4.在答题纸上,选择题、作图题用2B铅笔作答,其他试题用黑色字迹签字笔作答. 一、选择题(本题共24分,每小题3分)第1-8题均有四个选项,符合题意的选项只有一 个. 1. 数轴上A、B、C、D四个点的位置如图所示,这四个点中,表示2的相反数的点是( ) A. 点 A B. 点B C. 点C D. 点D 2. 如果 ( ),那么下列比例式中正确的是( ) A. B. C. D. 3. 在Rt△ABC中, , , ,则tanB的值为( ) A. B. 2 C. D. 的 4. 将二次函数图象 向下平移1个单位长度,所得二次函数 解析式是( ) A. B. C. D. 5. 如图,在△ABC中,D、E分别是边AB、AC上的点,且DE∥BC,若AD:DB=2:3,则△ADE与 △ABC的面积比等于( )A. 2:3 B. 4:5 C. 4:9 D. 4:25 的 6. 二次函数 图象如图所示, 则这个二次函数的表达式为( ) A. B. C. D. 7. 如图,点A、B、C都在⊙O上,若∠AOC=140°,则∠B的度数是( ) A. 70° B. 80° C. 110° D. 140° 8. 已知抛物线 上部分点的横坐标x与纵坐标y的对应值如下表: … 0 …… 1 0 … 有以下几个结论: ①抛物线 的开口向上; ②抛物线 的对称轴为直线 ; ③关于x的方程 的根为 和 ; ④当y<0时,x的取值范围是 <x< . 其中正确 的是( ) A. ①④ B. ②④ C. ②③ D. ③④ 二、填空题(本题共24分,每小题3分) 9. 方程组 的解是__________. 10. 一个圆柱体容器内装入一些水,截面如图所示,若⊙O中的直径为52cm,水面宽AB=48cm,则水的 最大深度为_______________cm. 的 11. 明为了测量一个小湖泊两岸 两棵树A、B之间的距离,在垂直AB的方向BC上确定点C,测得 BC=45m,∠C=40°,从而计算出AB之间的距离.则AB=_______________.(精确到0.1m)(参考 数据:sin40°≈0.64,cos40°≈0.77,tan40°≈0.84,sin50°≈0.77,cos50°≈0.64,tan50°≈1.19)的 12. 图,在⊙O中,若弧AB=BC=CD,则AC与2CD 大小关系是:AC ________2CD.(填“>”, “<”或“=”) 13. 如图,在Rt ABC中,∠ACB=90°,CD⊥AB于点D,AB=9,AC=6,则cos∠DCB = ______________△__ . 14. 如图,小明抛投一个沙包,沙包被抛出后距离地面的高度h(米)和飞行时间t(秒)近似满足函数关 系式 ,则沙包在飞行过程中距离地面的最大高度是________米. 15. 在反比例函数 的图象上有两点A(x,y),B(x,y),且x< x<0,y> y 写出一个符 1 1 2 2 1 2 1 2 合条件的函数表达式________________. 16. 如图,线段AB=9,AC⊥AB于点A,BD⊥AB于点B,AC=2,BD=4,点P为线段AB上一动点, 且以A、C、P为顶点的三角形与以B、D、P为顶点的三角形相似,则AP的长为_______________.三、解答题(本题共52分,其中第17-20题每小题5分,第21-23题每小题6分,第24, 25题每小题7分) 17. 解不等式组: . 18. 计算: . 19. 已知:如图,点M为锐角∠APB 的边PA上一点. 求作:∠AMD,使得点D在边PB上,且∠AMD =2∠P. 作法: ①以点M为圆心,MP长为半径画圆,交PA于另一点C,交PB于点D点; ②作射线MD. (1)使用直尺和圆规,依作法补全图形(保留作图痕迹); (2)完成下面的证明. 证明:∵P、C、D都在⊙M 上, ∠P为弧CD所对的圆周角,∠CMD为弧CD所对的圆心角, ∴∠P= ∠CMD( )(填推理依据). ∴∠AMD=2∠P. 20. 已知:如图, ABC∽△ACD,CD平分∠ACB,AD =2,BD =3,求AC、DC的长. △21. 一艘船向正北方向航行,在A处时看到灯塔S在船的北偏东30°的方向上,继续航行12海里到达B 处,看到灯塔S在船的北偏东60°的方向上.若继续沿正北方向航行,求航行过程中船距灯塔S的最近距 离.(结果精确到0.1海里)(参考数据: ≈1.41, ≈1.73) 22. 已知: AB为⊙O的直径,点D为弧BC的中点,过点D作⊙O的切线交AB的延长线于点E,连接 CB. (1)求证:BC∥DE; (2)若cosE= , DE =20,求BC的长.23. 在平面直角坐标系xOy中,有抛物线 ( ) . (1)求抛物线的顶点坐标(用含m的式子表示); (2)过点A(0,1)作y轴的垂线l,点B在直线l上且横坐标是2m+1 ①若m的值等于1,求抛物线与线段AB的交点个数; ②若抛物线与线段AB只有一个公共点,直接写出m的取值范围. 24. 如图,在Rt△ABC中,∠ACB=90°,AC=BC,点D为线段BC上一动点(不与点B, C重合),作 射线AD、AB,将射线AD、AB分别绕点A顺时针旋转90°,得到射线 , ,过点B作BC的垂线, 分别交射线 , 于点E,F. (1)依题意补全图形; (2)求证:AB=AF; (3)用等式表示线段AC,BD与BE之间的数量关系,并证明. 25. 在平面直角坐标系xOy中,对于点P,若点Q满足条件:以线段PQ为对角线的正方形,边均与某条 坐标轴垂直,则称点Q为点P的“正轨点”,该正方形为点P的“正轨正方形”如下图所示. (1)已知点A的坐标是(1,3). ①在(-3,-1),(2,2),(3,3)中,是点A的“正轨点”的坐标是 . ②若点A的“正轨正方形”的面积是4,写出一个点A的“正轨点”的坐标 . (2)若点B(1,0)的“正轨点”在直线y=2x+2上,求点B的“正轨点”的坐标; (3)已知点C(m,0),若直线y=2x+m上存在点C的“正轨点”,使得点C的“正轨正方形”面积小于 4,直接写出m的取值范围.
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  1. CONNECT:[ UseTime:0.000563s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000911s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000513s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000301s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000542s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000647s ]
  8. SELECT * FROM `wendang` WHERE `id` = 367007 LIMIT 1 [ RunTime:0.000555s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 367007 [ RunTime:0.011672s ]
  10. UPDATE `wendang` SET `lasttime` = 1773060835 WHERE `id` = 367007 [ RunTime:0.000559s ]
  11. SELECT * FROM `wendang` WHERE `id` < 367007 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000485s ]
  12. SELECT * FROM `wendang` WHERE `id` > 367007 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000351s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 367007 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004655s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 367007 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007554s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 367007 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002874s ]
0.103585s