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武汉市江岸区2025-2026学年八年级下学期期中监测数学试题

  • 2026-10-08 21:20:13
武汉市江岸区2025-2026学年八年级下学期期中监测数学试题

江岸区

2025-2026学年八年级下学期期中监测

数学试题

江岸区2025~2026学年度八(下)期中调研监测

数学试题

一、选择题:(本大题共10小题,每小题3分,共30分)

1.若在实数范围内有意义,则x的取值范围是()

A.x>5 B.x≥5 C.x≤5D.x≠5

2.下列二次根式中,是最简二次根式的是()

A.B.C.D.

3.下列计算正确的是()

A.×=B.+=C.4-=4 D.4+3=7

4.《周髀算经》记载“勾三股四弦五”,奠定了直角三角形判定基础.已知△ABC的三边为a,b,c,可以判定△ABC为直角三角形的是()

A.a=5,b=12,c=13 B.a=7,b=8,c=9

C.∠A=∠B=∠CD.∠A:∠B:∠C=3:4:5

5.小刘在长方形台球桌面上击球,球的运动轨迹形成四边形EFGH,台球每次撞击桌面时,入射方向与桌面的夹角等于反射方向与桌面夹角(如∠DEH=∠AEF),下列关于四边形EFGH推理中,说法错误的是()

A.∠HEF=∠HGFB.HF=EG

C.∠HGF+∠EHG=180° D.HE∥FG且HE=FG

第5题图第6题图第9题图

6.如图,在□ABCD中,点E为对角线BD上一点,且AE=DE=CD,∠C=117°,则∠BAE的度数为()

A.63°B.75°C.96°D.107° 

7.小明手工制作矩形木板,下列测量方法能确定其为矩形的是()

ABCD

8.在生活中,很多墙面与地面会用各种形状的瓷砖铺成,像这样用一些不重叠摆放的多边形将平面完全覆盖,叫做平面镶嵌,为了使镶嵌美丽多变,有时也可以用边长相同的两种正多边形进行镶嵌,下列不可以进行平面镶嵌的一组是()

A.正三角形、正四边形B.正三角形、正六边形

C.正五边形、正十边形D.正四边形、正六边形

9.如图,将矩形纸片ABCD沿EF对折,使AD与BC重合,再将△ABM沿BM折叠,使点A的对应点N落在折痕EF上,且AB=3,则EN的长为()

A.B.C.D.2

10.如图,在等腰直角三角形ABC中,P为斜边AC上一点,连接BP,AD⊥BP于点D,E为AD上一点,且AE=BD=2,EF⊥AD交AC于点F,S四边形DEFP=8,AB的长度为()

A.B.2C.D.2

二、填空题:(本大题共6小题,每小题3分,共18分)

11.计算:=.

12.若一个正多边形的每一个外角是45°,则它是正边形.

13.若菱形的对角线长分别为4和2,则菱形的面积为.

14.如图,点D、E、F分别为△ABC三边的中点,若AB=5cm,BC=6cm,AC=4cm,△DEF周长为

cm.

第14题图第15题图第16题图

15.如图,在Rt△ABC中,∠C=90°,∠B=30°,BC=2,点D为边AB一点,点B关于CD的对称点为点E,连CE交AB于F点,若△DEF为直角三角形,则CD=.

16.如图,在菱形ABCD中,∠ABC=120°,点E为CD的中点,点F为边BC上一点,∠EAF=30°,则=.

三、解答题:(共8题,共72分)

17.(本小题满分8分)计算:

(1);(2).

18.(本小题满分8分)已知x=2+,y=2-,求代数式2(x2-xy+y2)-(x2+y2)的值.

19.(本小题满分8分)如图,平行四边形ABCD中,BE=DF.求证:△ABE≌△CDF.

20.(本小题满分8分)如图,在梯形ABCD中,AD∥BC,AD=3,DE=,AB=2,BE=4,且AB⊥AE.

(1)求证:DE⊥AD;

(2)若∠B=∠C,求证:AB=DC.

21.(本小题满分8分)如图,在6×6的由小正方形组成的正方形网格中,点A、B均为格点,点C为横格线上一点,仅用无刻度的直尺按下列要求作图,并保留作图痕迹.

(1)如图1,画出线段AC的中点M;

(2)如图1,画点D,使四边形ABCD为平行四边形;

(3)如图1,在BC上画点E,使ME∥AB;

(4)如图2,在AB上画点G,使∠GCB=45°.

22.(本小题满分10分)【定理验证】

(1)小辛用四个全等的直角三角形对勾股定理的证明进行了再探究.拼成图1所示的图形后,从面积的角度思考,不难发现:大正方形面积=4个直角三角形面积+小正方形面积:

已知:Rt△ABC中,∠ACB=90°,AC=b,BC=a,AB=c.

证明:∵S△ABC=ab,正方形CFHG边长=a+b;

∴S正方形CFHG=(a+b)2=4×ab+c2,

则a、b、c的数量关系为:.

【图形变式】

(2)小辛利用两个全等的直角三角形拼成图2后发现:∠C=∠D=90°,设AC=b,BC=a,AB=c,此图也可以利用面积法证明勾股定理.请你帮小辛完成证明过程.

【迁移应用】

(3)小辛将两个全等的直角三角形拼成图3后:∠ACB=∠D=90°,设AC=b,BC=a,AB=c,请你判断能否利用面积法证明勾股定理,如果可以请说明理由.

23.(本小题满分10分)已知在□ABCD中,点E为AD边的中点.

(1)如图1,若BE⊥CE,求证:BE平分∠ABC;

(2)如图2,点F为DC延长线上一点,且∠ABE=∠F,

①求证:BE=EF;

②若CF=CD,AE=2,BE=3,求□ABCD的面积.

24.(本小题满分12分)已知在平面直角坐标系中,点A为x轴上一点,点B的坐标为(a,b),点C的坐标为(0,b),且满足+=0,∠BAO=60°,点P由点C出发,以m个单位/s的速度沿线段CB向点B运动,点Q由点A出发,以n个单位/s的速度沿x轴向点O运动,规定其中一个动点到达端点时,另一个动点也随之停止运动.

(1)求点A的坐标;

(2)如图1,若m=1,n=2,从运动开始,需经过多长时间,才能使PQ=AB?

(3)如图2,若点,当△PDQ为等边三角形时,直接写出的值.

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  1. CONNECT:[ UseTime:0.001234s ] mysql:host=127.0.0.1;port=3306;dbname=f460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001529s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000450s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000443s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001162s ]
  6. SELECT * FROM `set` [ RunTime:0.000470s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001388s ]
  8. SELECT * FROM `article` WHERE `id` = 543446 LIMIT 1 [ RunTime:0.000742s ]
  9. UPDATE `article` SET `lasttime` = 1793494145 WHERE `id` = 543446 [ RunTime:0.002295s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000419s ]
  11. SELECT * FROM `article` WHERE `id` < 543446 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000551s ]
  12. SELECT * FROM `article` WHERE `id` > 543446 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000550s ]
  13. SELECT * FROM `article` WHERE `id` < 543446 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000672s ]
  14. SELECT * FROM `article` WHERE `id` < 543446 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000936s ]
  15. SELECT * FROM `article` WHERE `id` < 543446 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000720s ]
0.059877s