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