华师大版八年级数学下册考试题

2025-04-01 20:42:24
推荐回答(1个)
回答1:

  大家完成了初一的学习,进入紧张的初二阶段。下面是应届毕业生考试网特地为大家整理的华师大版八年级数学下册考试题,欢迎阅读

   一、选择题(单项选择,每小题3分,共21分).

  1.要使分式 有意义, 必须满足的条件是( ).A. B. C. D.

  2. 下列代数式中,是分式的是( )A. B. C. D.

  3. 在平面直角坐标系中,点(2,-3)关于 轴对称的点的坐标是( ).

  A.(-2,-3) B.(2,-3) C.(-2,3) D.(2,3)

  4.如果把分式 中的 、 都扩大3倍,那么分式的值( )

  A.扩大3倍   B.不变  C.缩小3倍  D.缩小6倍

  5.若点P( )在第二象限,则 的取值范围是( )

  A. <1 B. <0 C. >0 D. >1

  6.函数 与 (a≠0)在同一直角坐标系中的图象可能是( )

  7.如图,小亮在操场上玩,一段时间内沿M→A→B→M的路径匀速散步,能近似刻画小亮到出发点M的距离y与x之间关系的函数图象是( )

   二、填空题(每小题4分,共40分)

  8. 若分式方程 有增根,则这个增根是

  9. 如图,反比例函数 的图象经过点P,则 = .

  10.用科学记数法表示:0.000 004=    .

  11. 将直线 向下平移4个单位得到直线 ,则直线 的解析式为 .

  12.直线 y=kx+b与直线y=-2x+1平行,且经过点(-2,3),则解析式为 .

  13. 已知点Q(-8,6),它到x轴的距离是 ,它到y轴的距离是

  14、如图,在矩形ABCD中,AB=3,AD=4,P是AD上一动点,PF⊥BD于F,PE⊥AC于E,则PE+PF的值为 .

  15、如图,在反比例函数 的图象上,有点 , , , ,它们的横坐标依次为1,2,3,4,分别过这些点作 轴与 轴的垂线,图中所构成的阴影部分的面积从左到右依次为 , , ,则 + + =

  16.14.如果菱形的两对角线分别为6 和8 ,则它的面积是 .

  17.如图,矩形ABCD中,AB=1 ,AC=2 ,对角线AC、BD相交于点O,直线BD绕点O逆时针旋转 (0°< <120°),交BC于点E,交AD于点F.

  (1)OA=  ;

  (2)若四边形AECF恰好为菱形,则 的值为    .

   三、解答题(共89分).

  18.(10分) 计算:(1) .(2)

  19、解方程(10分)(1)   (2)

  20.(7分) 先化简,再求值: 其中 .

  21、(9分)如图, 已知反比例函数y= 的图象与一次函数y=ax+b的图象交于

  M(2,m)和N(-1,-4)两点.

  (1)求这两个函数的解析式;(2)求△MON的面积;

  (3)请判断点P(4,1)是否在这个反比例函数的图象上,并说明理由.

  22.(9分)如图,菱形 的.对角线 、 相交于点 , , ,请说明四边形 是矩形.

  23.(9分)如图,在四边形ABCD中,AB=CD,BF=DE,AE⊥BD,CF⊥BD,垂足分别为E,F.

  (1)求证:△ABE≌△CDF;

  (2)若AC与BD交于点O,求证:AO=CO.

  24.(9分)如图,在梯形ABCD中,AD∥BC,AB=CD,且AB

  (1)(3分)直接填空:AB= ;

  (2)(6分)若直线AB以每秒0.5 的速度向右平移,交AD于点P,交BC于点Q,则当直线AB移动的时间为多少秒时,四边形ABQP恰好为菱形?(精确到0.1秒)

  25. (13分)如图11,矩形 中,点 在 轴上,点 在 轴上,点 的坐标是

  (-12,16),矩形 沿直线 折叠,使得点 落在对角线 上的点 处,折痕与 、 轴分别交于点 、 .

  ⑴直接写出线段 的长;

  ⑵求直线 解析式;

  ⑶若点 在直线 上,在 轴上是否存在点 ,使以 、 、 、 为顶点的四边形是平行四边形?若存在,请求出一个满足条件的点 的坐标;若不存在,请说明理由.

  26.(13分) 是等边三角形,点 是射线 上的一个动点(点 不与点 重合), 是以 为边的等边三角形,过点 作 的平行线,分别交射线 于点 ,连接 .

  (1)如图(a)所示,当点 在线段 上时,

  ①求证: ;

  ②探究:四边形 是怎样特殊的四边形?并说明理由;

  (2)如图(b)所示,当点 在 的延长线上时,

  ①第(1)题中所求证和探究的两个结论是否仍然成立?(直接写出,不必说明理由)

  ②当点 运动到什么位置时,四边形 是菱形?并说明理由.

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