2017年吉林省长春108中八年级上学期期末数学模拟试卷与解析答案

2017年吉林省长春108中八年级上学期期末数学模拟试卷与解析答案
2017年吉林省长春108中八年级上学期期末数学模拟试卷与解析答案

2016-2017学年吉林省长春108中八年级(上)期末数学模拟试

一、选择题(每题3分,共24分)

1.(3分)下列分式与分式相等的是()

A. B.C. D.

2.(3分)下列运算错误的是()

A.

B.

C.

D.

3.(3分)下列四组线段中,可以构成直角三角形的是()

A.4,5,6 B.2,3,4 C.,3,4 D.1,,3

4.(3分)一个长为4cm,宽为3cm的矩形被直线分成面积为x,y两部分,则y 与x之间的函数关系只可能是()

A. B. C. D.

5.(3分)已知a、b、c是△ABC的三边,a2﹣2ab+b2=0且2b2﹣2c2=0,那么△ABC的形状是()

A.直角三角形B.等腰三角形

C.等腰直角三角形 D.等边三角形

6.(3分)如图,AB=AC,CF⊥AB于F,BE⊥AC于E,CF与BE交于点D.有下列结论:

①△ABE≌△ACF;②△BDF≌△CDE;③点D在∠BAC的平分线上;④点C在AB 的中垂线上.

以上结论正确的有()个.

A.1 B.2 C.3 D.4

7.(3分)若函数y=kx﹣b的图象如图所示,则关于x的不等式k(x﹣3)﹣b>0的解集为()

A.x<2 B.x>2 C.x<5 D.x>5

8.(3分)八个边长为1的正方形如图摆放在平面直角坐标系中,经过原点的一条直线l将这八个正方形分成面积相等的两部分,则该直线l的解析式为()

A.y=﹣x B.y=﹣x C.y=﹣x D.y=﹣x

二、填空题(每空3分,共30分)

9.(3分)的平方根是.

10.(3分)若+|x2+3y﹣13|=0,则x+y=.

11.(3分)当时,为正数.

12.(3分)如图,AB、CD相交于点O,AD=CB,请你补充一个条件,使得△AOD ≌△COB,你补充的条件是.

13.(3分)如图,△ABC中,CD⊥AB于D,E是AC的中点.若AD=6,DE=5,

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