2013-2014学年七年级上期末数学试题及答案

2013—2014

学年度第一学期期末考试

初一数学 2014年1月

一、选择题:(每题2分,共20分)

1. 下列式子中,正确的是 ············································································ ( )

111

A.|-5|=-5 B.-|5|=-5 C.|-0.5|=- D.-|-|=

2222. 下列计算正确的是 ·················································································· ( )

A.7a+a=7a 2 B.5y-3y=2 C.3x2y-2yx2=x2y D.3a+2b=5ab 1

3. 在-1,1.2,|-2|,0,+(-2),(-1)2014中,负数的个数有 ······················· ( )

2 A.2个 B.3个 C.4个 D.5个

4. 今年国庆期间全国首次实行免收7座及以下小型客车公路通行费,据交通部门统计,免费首日全国道路旅客运输量共完成85 600 000人,则该人数用科学计数法表示应为 ······················· ( )

A.85.6×106 B.856×105 C.8.56×107 D.8.56×108

5. 沿圆柱体上面直径截去一部分的物体如图所示,它的俯视图是 ························· ( )

A. B. C. D.

6. 实数a、b在数轴上的位置如右图所示,则化简a?2b?|a?b|的结果为 ········· ( ) A. 3b B.?2a?b C.2a +b D.b

aOb7. 如图中的两个角∠1和∠2之间的关系是 ······················································ ( ) A.同位角 B.内错角 C.同旁内角 D.对顶角

1 ANCMB

2(第8题) (第9题)

(第7题)

8. 如图,线段AB=8cm,C是线段AB上一点,AC=3.2cm,M是AB的中点,N是AC的中点, 则线段MN的长等于 ················································································ ( )

A.2.3cm B.2.4cm C.2.5cm D.3cm 9.按照如图的平面展开图折叠成正方体后,相对面上的两个数都互为相反数,

那么(a+c)b的值等于 ··················································································· ( )

A. 1 B. -1

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