2012年西藏中考数学真题.doc

thrift of excellent traditional and style lack deep of understanding, one-sided think in now of good situation Xia, economic smooth more fast development, and reform made major progress, and people living significantly improve, and social the career made new progress, no necessary always hard has, no awareness to China also has many poverty area, and also has many poverty population of exists, more living improve has, more need keep hard of style. Three is not strictly honest. 　　Total thought units is a water sector, clean self-discipline away from himself too far, no real processing good living of improve and hard, and thrift excellent traditional of relationship, no effective do comply with Constitution and party of regulations must from I do up, no right mercy good bitter Le, and wealth of relationship, no right awareness to in comply with Constitution and party of regulations aspects everyone has accountability. Four, future direction and improvement measures 1, belief and faith, strengthen party spirit. One is to firmly establish the noble ideals of struggle for the ideals of communism, communist struggle for life, ready to sacrifice everything for the party and the people. Second is to continuously improve the quality and standard of political, conscientiously study Deng Xiaoping theory and "three represents" important thought and the scientific Outlook on development, implement the party's basic program for the primary stage of socialism, adhere to the correct political orientation, maintain highly consistent with the CPC Central Committee, is good at theories of socialism with Chinese characteristics to analyze and solve problems. 　　Third, strengthening the party spirit and the world transformation, perseverance of the party Constitution, relive Party vows to establish correct world Outlook, Outlook on life and the world, practically embodies ideals and beliefs into action, combine lofty ideals and practical activities, transforming the objective world, actively participate in the great practice of building socialism with Chinese characteristics. 2, keep the purpose in concept, changing the style of work. First, keep in mind that the purpose of serving, adhere to assuming power for the people, keep in mind the people and care about people, and the joys and sorrows of the masses, ...
　　According to city discipline, and municipal organization Department requirements, today we held "implement implementation independent Commission against corruption guidelines effective strengthening led cadres style construction" topic democratic life, main task is close contact thought, and work actual, control check district Standing Committee team and the personal in implementation independent Commission against corruption guidelines Shang exists of problem, in-depth carried out criticism and self-critical, further clear rectification direction and measures, effective enhanced clean politics of consciousness and initiative, firm set good of ruling image. Before the meeting, the way we take surveys solicited a views, combed, related to team building
2012年西藏中考数学真题

一、选择题（本大题共12小题，每小题3分，满分36分）
1．﹣5的相反数是（　　）

A．
﹣5
B．
5
C．
±5
D．

2．已知地球上海洋面积约为361 000 000km2，361 000 000这个数用科学记数法可表示为（　　）

A．
3.61×106
B．
3.61×107
C．
3.61×108
D．
3.61×109

3．平面直角坐标系中，点P的坐标为（﹣5，3），则点P关于y轴的对称点的坐标是（　　）

A．
（5，3）
B．
（﹣5，﹣3）
C．
（3，﹣5）
D．
（﹣3，5）

4．一元二次方程的根的情况是（　　）

A．
有两个相等的实数根
B．
有两个不相等的实数根

C．
无实数根
D．
不能确定

5．2012年7月27日国际奥委会的会旗将在伦敦上空升起，会旗上的图案由五个圆环组成．如图，在这个图案中反映出的两圆的位置关系有（　　）
A．
内切、相交
B．
外离、内切
C．
外切、外离
D．
外离、相交

6．如图是每个面上都有一个汉字的正方体的一种展开图，那么在原正方体的表面上，与汉字“美“相对的面上的汉字是（　　）

A．
我
B．
爱
C．
长
D．
沙

7．已知等腰三角形的两边的长分别为3和6，则它的周长为（　　）

A．
9
B．
12
C．
15
D．
12或15

8．2012年全区中学生运动会，需要从3名男生和2名女生中随机抽取1名志愿者，则女生被抽中的概率是（　　）

A．

B．

C．

D．

9．下列各式计算正确的是（　　）

A．
（a+b）2=a2+b2
B．
a2•a3=a5
C．
a6+a6=a12
D．
a10÷a2=a5

10．下列各命题中，真命题是（　　）

A．
不在同一直线上的三个点确定一个圆

B．
三角形的外心是三角形三条高的交点

C．
邻边相等的四边形是菱形

D．
三角形的一个外角大于三角形任意一个内角

11．如图，AB切⊙O于点B，延长AO交⊙O于点C，连接BC．若∠A=40°，则∠C=（　　）

A．
20°
B．
25°
C．
40°
D．
50°

12．若式子有意义，则x的取值范围为（　　）

A．
x≤2
B．
x≤2且x≠1
C．
x≥2
D．
x≥1

二、填空题（本大题共6小题，每小题3分，满分18分）
13．某样本数据是2，2，x，4，4，6，如果这个样本的众数是2，则x的值是　_________　．

14．在实数范围内分解因式：x2﹣3=　_________　．

15．如图，已知直线a∥b，∠1=50°，则∠2=　_________　°．

16．如图，小明从纸上剪下一个圆形和一个扇形纸片，用它们恰好能围成一个圆锥模型．若圆的半径为1，扇形的圆心角为120°，则此扇形的半径为　_________　．

17．如图，点P在∠AOB的平分线上，若使△AOP≌△BOP，则需添加的一个条件是　_________　．（只写一个即可，不添加辅助线）

18．用同样大小的小圆按下图所示的方式摆图形，第1个图形需要1个小圆，第2个图形需3个小圆，第3个图形需要6个小圆，第4个图形需要10个小圆，按照这样的规律摆下去，则第n个图形需要小圆　_________　个（用含n的代数式表示）．

三、解答题（本大题共7小题，满分46分）
19．计算：．

20．解方程：

21．为了加快西藏旅游业发展，某旅行社开发了“坐皮筏、看蓝天、游碧水”的旅游项目．一只皮筏艇由河岸的A处景点沿直线方向开往对岸的B处景点（如图），若两侧的河岸平行，河宽为900m，AB与河岸的夹角是60°，皮筏艇的航行速度为204m/min，求皮筏艇从A处景点开到B处景点所需的时间（≈1.7）．

22．某班观看电影《和雷锋在一起的日子》，有甲、乙两种电影票，甲种票每张24元，乙种票每张18元．如果全班35名同学购票用去750元，那么甲、乙两种电影票各多少张？

23．如图，四边形ABCD是菱形，AE⊥BC交CB的延长线于点E，AF⊥CD交CD的延长线于点F．求证：AE=AF．

24．如图，在⊙O中，弦BC垂直于半径OA，垂足为E，D是优弧上一点，连接 BD，AD，OC，∠ADB=30°．
（1）求∠AOC的度数；
（2）若弦BC=6cm，求图中阴影部分的面积．

25．为了落实国家的惠农政策，某地政府制定了农户投资购买收割机的补贴办法，其中购买Ⅰ、Ⅱ型收割机所投资的金额与政府补贴的额度存在下表所示的函数对应关系：

Ⅰ型收割机

Ⅱ型收割机

投资金额x（万元）
x
5
x
2
4
补贴金额x（万元）
y1=kx
2
y2=ax2+bx
2.4
3.2
（1）分别求出y1和y2的函数解析式；
（2）旺叔准备投资10万元购买Ⅰ、Ⅱ两型收割机．请你设计一个能获得最大补贴金额的方案，并求出按此方案能获得的补贴金额．

在整体感知的基础上，学习从内容、表现技巧等方面对作品进行赏析，感悟作品的艺术魅力，获得丰富的审美感受。本单元的设置意图是在必修2古代诗歌学习的基础上，进一步提高学生的诗歌鉴赏能力。project work, cadres, cadres selection and other aspects of a total of 19, further defined the direction of rectification, enhancing the pertinence and effectiveness of democratic life. 　　Good for this meeting, we requested the Standing Committee of the municipal party Committee, municipal Secretary General Tang Wenjin, the City Commission for discipline inspection Standing Committee Yang Xu, Jiang Jixue, Deputy Director of the personnel office, and other leading comrades present guidance allows us to warm applause for their welcome and thanks! 　　Below, I first District Committee member of the 20XX team annual democratic meeting implementation of the corrective measures, as well as member of the team and of my own report guidelines for the implementation of the independent Commission against corruption statement invited leaders and comrades criticism. First, annual party on the 20XX team, Member of democratic life action plan implementation year 20XX, district democratic meeting a member of the team on "study and practice the scientific Outlook on development" theme, find a project supporting strong enough, the industry well enough, urban construction management level needs to be improved, livelihood improvement needs to be strengthened, district team itself, such as the five aspects. 　　Year of 20XX, we find out the problems mentioned above, based on actual Shunqing construction and development, conscientiously sum up improvements, achieving significant development results and effectiveness of their work. (A) highlight the project handle, maintain high growth of investment. Adhere to the strategy as a Foundation, carrying out projects to promote increased stamina important. One is to increase the intensity of projects towards. Actively seek national and provincial policy support, superior special transfer payments, a variety of additional income will top 700 million Yuan, a number of key infrastructure projects, livelihood projects, industrial projects into the cage. Second, increasing the project attracts. This year a total of 23 signed a major project, of which 14 billion project, China Metallurgical group, vanke group, Guangdong hengda group, Taiwan Ruentex group, on the RI group, Shenzhen Kaisa, jifeng agricultural machinery, Mercedes-Benz, Audi 4S store and other large enterprises and projects have settled in Shunqing. Third, strengthen project construction. Annual implementation focus project 39 a, fixed assets investment total will breakthrough 12 billion yuan, created district yilai history high, South door dam, and five in shop old city transformation, and Ying China industrial concentrated district construction, and city main road construction, and Northeast steam Trade Center, and modern farmers industry Park, and vocational education city, and low rental, and also room construction, and features blocks build, and farmers market transformation, and "rural version" Street transformation, focus engineering speed up implementation, effectiveness obviously. Expected to be achieved this year, area-wide GDP 17 billion