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2025−2026学年湖南省长沙市雨花区九年级(上)期末数学试卷

  • 2026-02-05 12:49:53
2025−2026学年湖南省长沙市雨花区九年级(上)期末数学试卷

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2025−2026学年湖南省长沙市雨花区九年级(上)期末数学试卷
一、选择题(在下列各题的四个选项中,只有一项是符合题
1.已知(a,−2)和(3,b)关于原点对称,则(a+b)2026的值为(  )
A、1B、−1
C、−52026D、52026
2.由二次函数y=2(x−3)2+1可知(  )
A、其图象的开口向下
B、其图象的对称轴为x=−3
C、其最大值为1
D、当x<3时,y随x的增大而减小
3.下列几何体是由4个相同的小正方体搭成的,其中主视图、左视图、俯视图都相同的是(  )
A、B、
C、D、
4.若a+c=b,则关于x的方程ax2+bx+c=0(a≠0)必有一根是(  )
A、2B、1C、−1D、0
5.一只不透明的袋子中装有4个黑球、2个白球,每个球除颜色外都相同,从中任意摸出3个球,下列事件为必然事件的是(  )
A、至少有1个球是黑球
B、至少有1个球是白球
C、至少有2个球是黑球
D、至少有2个球是白球
6.如图,线段AB是⊙O的直径,弦CD⊥AB,∠CAB=20°,则∠AOD等于(  )
A、160°B、150°
C、140°D、120°
7.在反比例函数y=−
1
x
的图象上有三点(x1,y1),(x2,y2),(x3,y3).若x1>x2>0>x3,则下列各式正确的是(  )
A、y3>y1>y2B、y3>y2>y1
C、y1>y2>y3D、y1>y3>y2
8.如图,在菱形ABCD中,点E在BC上,AE与对角线BD交于点F.若AB=5,BE=3,则
AF
EF
为(  )
A、
3
5
B、
5
4
C、
4
3
D、
5
3
9.已知二次函数y=ax2+bx+c的图象如图所示,则一次函数y=bx+c的图象和反比例函数y
abc
x
的图象在同一坐标系中大致为(  )
A、B、
C、D、
10.如图,在▱ABCD中,对角线AC,BD相交于点O,点E为OC的中点,EF∥AB交BC于点F.若AB=4,则EF的长为(  )
A、
1
2
B、1
C、
4
3
D、2
二、填空题(本大题共6小题,每小题3分,共18分)
11.二次函数y=−2(x+1)2+3的顶点坐标为.
12.已知a是方程x2+2x−2=0的一个根,则代数式(a+1)2的值为.
13.在△ABC中,∠C=90°,若tanA=
1
2
,则sinB=.
14.从3、5、6、9中随机取一个数作为十位数字,再从余下的数中随机取一个数作为个位数字组成两位数,这个两位数是奇数的概率是.
15.如图,小东用长2米的竹竿CD做测量工具,测量学校旗杆的高度AB,移动竹竿,使竹竿、旗杆顶端的影子恰好落在地面的同一点O.此时,OD=3米,DB=9米,则旗杆AB的高为米.
16.“轮动发石车”是我国古代的一种投石工具,在春秋战国时期被广泛应用,图1是陈列在展览馆的仿真模型.图2是模型驱动部分的示意图,其中⊙M,⊙N的半径分别是1cm和10cm,当⊙M顺时针转动3周时,⊙N上的点P随之旋转n°,则n=.
三、解答题(本大题共9小题,第17、18、19题每小题6分,第20、21题每小题6分,第22、23题每小题6分,第24、25题每小题6分,共72分.解答应写出文字说明、证明过程或演算步骤)
17.计算:(sin30°)2+tan60°−(sin45°)2+(cos30°)2
18.解方程:(x2+x)2−5(x2+x)+4=0
19.如图,在△ABC中,sinB
1
3
,tanC=3,AB=3,求AC的长.
20.某商场以每件210元的价格购进一批商品,当每件商品售价为270元时,每天可售出30件,为了促销,商场决定适当降价,经调查发现,如果每件商品降价1元,那么商场每天就可以多售出3件.
(1)降价前商场每天销售该商品的利润是多少元?
(2)要使商场每天销售这种商品的利润达到降价前每天利润的两倍,且更有利于减少库存,则每件商品应降价多少元?
21.如图,反比例函数y
k
x
(k≠0,x>0)
与一次函数y=−x+3的图象交于A(1,a)和B两点,与x轴交于点C.
(1)求反比例函数的解析式;
(2)若点P在x轴上,且△APC的面积为5,求点P的坐标.
22.如图,△ABC中,AB=AC=8,BC=6,点D为BC上一点,过D作射线DE交AC于点E,且满足∠ADE=∠B.
(1)求证:△ABD∽△DCE;
(2)设BD=x,CE=y,写出y关于x的函数表达式,当x取何值时y值最大,最大值是多少?
23.无人机在实际生活中应用广泛.如图,小明利用无人机测量大楼的高度,无人机在空中P处,测得楼CD楼顶D处的俯角为45°,测得楼AB楼顶A处的俯角为60°.已知楼AB和楼CD之间的距离BC为100米,楼AB的高度为10米,从楼AB的A处测得楼CD的D处的仰角为30°(点A,B,C,D,P在同一平面内).
(1)填空:∠APD=,∠ADC=;
(2)求楼CD的高度;(精确到0.1米)
(3)求此时无人机距离地面BC的高度.(参考数据:
2
≈1.414,
3
≈1.732)
24.已知AB是⊙O的直径,PB是⊙O的切线,C是⊙O上的点,AC∥OP,M是直径AB上的动点,A与直线CM上的点连线距离的最小值为d,B与直线CM上的点连线距离的最小值为f.
(1)求证:PC是⊙O的切线;
(2)设OP=
3
2
AC,求∠CPO的正弦值;
(3)设AC=9,AB=15,求d+f的取值范围.
25.如图①,已知y=ax2+bx+c的图象经过点A(0,3)、B(1,0),其对称轴为直线l:x=2,过点A作AC∥x轴交抛物线于点C,∠AOB的平分线交线段AC于点E,点P是抛物线上的一个动点,其横坐标为m.
(1)求抛物线的解析式;
(2)若P在直线OE下方,连接PE、PO,当m为何值时四边形AOPE面积最大,并求出其最大值;
(3)如图②,以P为旋转中心,将PO顺时针旋转90°得到PF,点F恰好落在直线l上,求出符合条件的点P的坐标.

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  1. CONNECT:[ UseTime:0.001084s ] mysql:host=127.0.0.1;port=3306;dbname=e460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001625s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008535s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005475s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001471s ]
  6. SELECT * FROM `set` [ RunTime:0.006835s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001387s ]
  8. SELECT * FROM `article` WHERE `id` = 469697 LIMIT 1 [ RunTime:0.013080s ]
  9. UPDATE `article` SET `lasttime` = 1770436807 WHERE `id` = 469697 [ RunTime:0.011313s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.005885s ]
  11. SELECT * FROM `article` WHERE `id` < 469697 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001034s ]
  12. SELECT * FROM `article` WHERE `id` > 469697 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001816s ]
  13. SELECT * FROM `article` WHERE `id` < 469697 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010897s ]
  14. SELECT * FROM `article` WHERE `id` < 469697 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.020402s ]
  15. SELECT * FROM `article` WHERE `id` < 469697 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010161s ]
0.266885s