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精品解析:北京市昌平区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:北京市昌平区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:北京市昌平区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:北京市昌平区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:北京市昌平区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:北京市昌平区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:北京市昌平区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:北京市昌平区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:北京市昌平区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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昌平区 2020-2021 学年第一学期初三年级期末水平测试 数 学 试 卷 本试卷共5页,共100分,考试时长120分钟 一、选择题(共8道小题,每小题3分,共24分) 1. 如图,以点P为圆心,以下列选项中的线段的长为半径作圆,所得的圆与直线l相切的是( ) A. PA B. PB C. PC D. PD 2. 已知 ,那么下列比例式中成立的是( ) A. B. C. D. 3. 二次函数 的顶点坐标是( ) A. B. C. D. 的 4. 如图,AB是⊙O 直径,CD是⊙O的弦,如果∠ACD=36°,那么∠BAD等于( ) A. 36° B. 44° C. 54° D. 56° 5. 已知二次函数y=(x﹣1)2+1,若点A(0,y)和B(3,y)在此函数图象上,则y 与y 的大小关系是 1 2 1 2 ( ) A. y>y B. y<y C. y=y D. 无法确定 1 2 1 2 1 26. 小英家在学校的北偏东40度的位置上,那么学校在小英家的方向是( ) A. 南偏东40度 B. 南偏西40度 C. 北偏东50度 D. 北偏西50度 7. 如图,△ABC的顶点都在正方形网格的格点上,则tan∠ACB的值为( ) A. B. C. D. 8. 如图,点M坐标为(0,2),点A坐标为(2,0),以点M为圆心,MA为半径作⊙M,与x轴的另 一个交点为B,点C是⊙M上的一个动点,连接BC,AC,点D是AC的中点,连接OD,当线段OD取得 最大值时,点D的坐标为( ) A. (0, ) B. (1, ) C. (2,2) D. (2,4) 二、填空题(共8道小题,每小题3分,共24分) 9. 请写出一个开口向上且过点(0,﹣2)的抛物线表达式为 ___. 10. 点 , 是反比例函数 图象上的两点,那么 , 的大小关系是 ______ . (填“>”,“<”或“=”) 11. 图,正六边形ABCDEF内接于⊙O,⊙O的半径为6,则 的长为__________.12. 图,平行四边形ABCD中,延长AD至点E,使DE= AD,连接BE,交CD于点F,若△DEF的面积 为2,则△CBF的面积为__________. 13. 如图,AB是⊙O的直径,弦CD⊥AB,垂足为点E, CD=16,BE=4,则CE=____,⊙O的半径为 _____. 14. 如图,⊙O是△ABC的内切圆,切点分别为D,E,F,已知∠A=40°,连接OB,OC,DE,EF,则 ∠BOC=__________°,∠DEF=__________°. 15. 二次函数y=ax²+bx+c图象上部分点的横坐标x,纵坐标y的对应值如下表: x … ﹣ ﹣ 0 1 2 … m …2 1 ﹣ y … 0 4 6 6 4 … … 6 则这个二次函数的对称轴为直线x=________,m=________(m>0). 16. 抛物线 交x轴于点A(a,0)和B(b,0)(点A在点B左侧),抛物线的顶点为 D,下列四个结论:①抛物线过点(2,m);②当m=0时,△ABD是等腰直角三角形;③a+b=4;④抛 物线上有两点P( , )和Q( , ),若 < ,且 + >2,则 > .其中结论正确的 序号是______________________. 三、解答题(共4道小题,每小题5分,共20分) 17. 计算: . 18. 如图,AC平分∠BAD,∠B=∠ACD. (1)求证:△ABC∽△ACD; (2)若AB=2,AC=3,求AD的长. 19. 已知二次函数 . (1)写出该二次函数图象的对称轴及顶点坐标,再描点画图; 的 (2)结合函数图象,直接写出 时x 取值范围.的 20. 下面是小东设计 “过圆外一点作这个圆的切线”的尺规作图过程. 已知:⊙O及⊙O外一点P. 求作:直线PA和直线PB,使PA切⊙O于点A,PB切⊙O于点B. 作法:如图, ①作射线PO,与⊙O交于点M和点N; ②以点P为圆心,以PO为半径作⊙P; ③以点O为圆心,以⊙O的直径MN为半径作圆,与⊙P交于点E和点F,连接OE和OF,分别与⊙O交 于点A和点B; ④作直线PA和直线PB. 所以直线PA和PB就是所求作的直线. (1)使用直尺和圆规,补全图形;(保留作图痕迹) (2)完成下面的证明. 证明:连接PE和PF, ∵OE=MN,OA=OM= MN, ∴点A是OE的中点. ∵PO=PE, ∴PA⊥OA于点A ( )(填推理的依据).同理PB⊥OB于点B. ∵OA,OB为⊙O的半径, ∴PA,PB是⊙O的切线.( )(填推理的依据). 四、解答题(共2道小题,21题5分,22题6分,共11分) 21. 某校九年级数学兴趣小组的同学进行社会实践活动时,想利用所学的解直角三角形的知识测昌平中心 公园的仿古建筑“弘文阁”AB的高度.他们先在点C处用高1.5米的测角仪CE测得“弘文阁”顶A的仰角为 30°,然后向“弘文阁”的方向前进18m到达D处,在点D处测得“弘文阁”顶A的仰角为50°.求“弘文 阁”AB的高(结果精确到0.1m,参考数据:,tan50°≈1.19,tan40°≈0.84, ). 22. 如图,AB为⊙O的直径,点C,D是⊙O上的点,AD平分∠BAC,过点D作AC的垂线,垂足为点 E. 的 (1)求证:DE是⊙O 切线; (2)延长AB交ED的延长线于点F,若⊙O半径的长为3,tan∠AFE= ,求CE的长. 五、解答题(共3道小题,每小题7分,共21分) 23. 在平面直角坐标系 中,抛物线 与 轴交于点A,将点A向右平移2个单位长度,得到点B,点B在抛物线上. (1)①直接写出抛物线的对称轴是________; ②用含a的代数式表示b; (2)横、纵坐标都是整数的点叫做整点.若抛物线与 轴交于P、Q两点,该抛物线在P、Q之间的部分 与线段PQ所围成的区域(不包括边界)恰有七个整点,结合函数图象,求a的取值范围. 24. 在△ABC中,AB=AC,∠BAC=90°,点D是线段BC上的动点(BD>CD),作射线AD,点B关于 射线AD的对称点为E,作直线CE,交射线AD于点F.连接AE,BF. (1)依题意补全图形,直接写出∠AFE的度数; (2)用等式表示线段AF,CF,BF之间的数量关系,并证明. 25. 在平面直角坐标系 中,给出如下定义:若点 在图形 上,点 在图形 上,如果 两点间 的 距离有最小值,那么称这个最小值为图形 的“近距离”,记为 .特别地,当图形 与 图形 有公共点时, . 已知A(-4,0),B(0,4),C(4,0),D(0,-4), (1)d(点A,点C)=________,d(点A,线段BD)=________; (2)⊙O半径为r, ① 当r = 1时,求 ⊙O与正方形ABCD的“近距离”d(⊙O,正方形ABCD); ② 若d(⊙O,正方形ABCD)=1,则r =___________. (3)M 为x轴上一点,⊙M的半径为1,⊙M与正方形ABCD的“近距离”d(⊙M,正方形ABCD)< 1,请直接写出圆心M的横坐标 m的取值范围.
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  1. CONNECT:[ UseTime:0.000844s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001392s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000711s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001406s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001440s ]
  6. SELECT * FROM `set` [ RunTime:0.003681s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001532s ]
  8. SELECT * FROM `wendang` WHERE `id` = 358604 LIMIT 1 [ RunTime:0.003913s ]
  9. UPDATE `wendang` SET `liulancishu` = 5 WHERE `id` = 358604 [ RunTime:0.011242s ]
  10. UPDATE `wendang` SET `lasttime` = 1773088392 WHERE `id` = 358604 [ RunTime:0.010309s ]
  11. SELECT * FROM `wendang` WHERE `id` < 358604 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.014489s ]
  12. SELECT * FROM `wendang` WHERE `id` > 358604 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001205s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 358604 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010515s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 358604 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006039s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 358604 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006534s ]
0.242162s