1、2011年初中毕业升学考试（宁夏卷）数学解析版 选择题 已知三角形的两边长分别为 4cm和 9cm,则下列长度的线段能作为第三边的是（ ） A 13cm B 6cm C 5cm D 4m 答案： B （ 2011 宁夏）一个两位数的十位数字与个位数字的和是 8，把这个两位数加上 18，结果恰好成为数字对调后组成的两位数，求这个两位数设个位数字为 x，十位数字为 y，所列方程组正确的是（ ） A B C D 答案： B （ 2011 宁夏）将 “创建文明城市 ”六个字分别写在一个正方体的六个面上，这 个正方体的平面展开图如图所示，那么在这个正方体中，和 “创 “相对的字是（ ） A文 B明 C城
2、 D市 答案： B （ 2011 宁夏）已知 O1、 O2的半径分别是 r1=3、 r2=5若两圆相切 ，则圆心距 O1O2的值是（ ） A 2或 4 B 6或 8 C 2或 8 D 4或 6 答案： C （ 2011 宁夏）某校 A、 B两队 10名参加篮球比赛的队员的身高（单位： cm）如下表所示： 队员 队 1号 2号 3号 4号 5号 A队 176 175 174 171 174 B队 170 173 171 174 182 设两队队员身高的平均数分别为 ，身高的方差分别为 SA2， SB2，则正确的选项是（ ） A、 B、 C、 D、 答案： D （ 2011 宁夏）如图， ABO的
3、顶点坐标分别为 A（ 1， 4）、 B（ 2， 1）、 O（ 0， 0），如果将 ABO绕点 O按逆时针方向旋转 90，得到 ABO，那么点 A、 B的对应点的坐标是（ ） A A（ 4， 2）， B（ 1， 1） B A（ 4， 1）， B（ 1， 2） C A（ 4， 1）， B（ 1， 1） D A（ 4， 2）， B（ 1， 2） 答案： B 不等式 的正整数解有（ ）个 A 1 B 2 C 3 D 4 答案： C 某人到瓷砖店去买一种多边形的瓷砖 ,用来铺设无缝的地板，他购买的瓷砖不可 能的是（ ） A等边三角形 B正方形 C正六边形 D正八边形 答案： D 若不等式组的解集为 ,则
4、图中表示正确的是( ) 答案： D 考点：在数轴上表示不等式的解集 分析：本题可根据数轴的性质 “实心圆点包括该点用 “”， “”表示，空心圆点不包括该点用 “ ”， “ ”表示，大于向右小于向左 ”画出数轴 解：不等式组的解集为 -1x3在数轴表示 -2和 3以及两者之间的部分： 故选 D 要清 楚地表明一位病人的体温变化情况 ,应选用的统计图为 ( ) A扇形统计图 B折线统计图 C条形统计图 D以上都可以 答案： B .不等式组 的解集是 ( ) 答案： A 不等式 的解集为 ( ) A x2 B x1 C x1 D x2 答案： B 如图 1,直线 a,b相交于点 O,若 ,则 的度数
5、为( ) 答案： C 下列说法正确的是 ( ) A同位角相等 B如果 C相等的角是对顶角 . D若 a b,b c,则 a c. 答案： D 下列式子 : 中是二元一次方程的有 ( )个 . A 1 B 2 C 3 D 4 答案： A （ 2011 宁夏）等腰梯形的上底是 2cm，腰长是 4cm，一个底角是 60，则等腰梯形的下底是（ ） A 5cm B 6cm C 7cm D 8cm 答案： B 过 D作 DE AB交 BC于 E， DE AB， AD BC， 四 边形 ABED是平行四边形， AD=BE=2cm， DE=AB=4cm， DEC= B=60， AB=DE=DC， DEC是等边
6、三角形， EC=CD=4cm， BC=4cm+2cm=6cm 故选 B 已知方程组 ( ) A 1 B 2 C 3 D 4 答案： D 若多边形的边数由 3增加到 n时 ,其外角和的度数 ( ). A增加 B减少 C不变 D变为 答案： C 填空题 （ 2011 宁夏）如图是一个几何体的三视图，这个几何体的全面积为 （ 取3.14）答案： .42 （ 2011 宁夏）如图，在 ABC中， DE AB， CD： DA=2： 3， DE=4，则 AB的长为 答案： （ 2011 宁夏）在一次社会实践活动中，某班可筹集到的活动经费最多 900元此次活动租车需 300元，每个学生活动期间所需经费 15
7、元，则参加这次活动的学生人数最多为 答案：人 （ 2011 宁夏）分解因式： a3a= 答案： a（ a+1）（ a1） （ 2011 宁夏）如图，点 A、 D在 O上， BC是 O的直径，若 D=35，则 OAB的度数是 答案： （ 2011 宁夏）某商场在促销活动中，将原价 36元的商品，连续两次降价 m%后现价为 25元根据题意可列方程为 答案：（ 1m%） 2=25 （ 2011 宁夏）若线段 CD是由线段 AB平移得到的，点 A（ 2， 3）的对应点为 C（ 3，6），则点 B（ 5， 2）的对应点 D的坐标是 答案：（ 0， 1） （ 2011 宁夏）数轴上 A、 B两点对应的实数
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