中考数学规律题专题讲解.doc

rapid development of the market economy environment to explore public servants duty consumption monetization reform has provided a good foundation. The socialization of rear service work has been launched, and rapid progress in some places and departments, duty consumption monetization of carrier and approach to management has been resolved. Third, in recent years, exploring the monetization of duty consumption has made some progress, have gained some experience and can provide reference to the comprehensive reform of the system of public servants duty consumption further. Implementing an honest canteen, standardize official entertaining management; enhancing the telecommunication expense management; elimination of County travel and countryside subsidies; research village officials capitalization management of corporate spending, and so on. Finally, group .18 session to be held in Beijing from November 9, 2013 to 12th. 35 years ago blew the third plenary session of the reform and opening up in the spring breeze, changed, affect the world; today, 35 years later, in the eyes of the nation and the world expect, again to reform mark China, ushered in the 18 session. XI General Secretary pointed out that Chinas reform has entered a crucial period and the Sham Shui Po District, must be based on greater political courage and wisdom, lose no time in deepening reform in important fields. Dares to crack a hard nut, dares to question the Rapids, which dares to break the barrier of ideas, and dare to benefit cure barriers. Deepening reform and opening up is on schedule to achieve institutional safeguards of the moderately well-off. Under the five in one the General layout of socialist modernization requirements, 18 session of the decision was a five in one and the improvement of overall scheme of reform, will promote an integrated and coordinated economic, political, cultural, social and ecological civilization construction of the five reforms and the partys construction in the area of institutional reform. The five in one programme is to achieve a comprehensive reform of institutional guarantees for objectives of build a well-off society, the smooth progress of the construction of a well-off society and reform the objectives of the programme. One, holding time and place importance on November 9, 2013 to the 18 session of the 12th Beijing since 1978, 35, have been 7 plenary session, each time on major issues of political and economic life of the country has made important deployment. In accordance with PRC political practice, often at every session of the CPC Central Committee in a plenary session was held immediately after the partys Congress, on the theme personnel, discussing election Centrals top leaders, such as the election of the Standing Committee of the political Bureau, through the Central Committee members, decisions, such as members of the Central Military Commission. The second plenary session, is held in two sessions before the general election, mainly to discuss a new State personnel issues. But by the third中考数学复习专题找规律1、如图所示，观察小圆圈的摆放规律，第一个图中有5个小圆圈，第二个图中有8个小圆圈，第100个图中有_个小圆圈 （1） （2） （3）2、 找规律下列图中有大小不同的菱形，第1幅图中有1个菱形，第2幅图中有3个菱形，第3幅图中有5个菱形，则第4幅图中有 个菱形,第幅图中有 个菱形1233、用同样大小的黑色棋子按下图所示的方式摆图形，按照这样的规律摆下去，则第n个图形需棋子 枚（用含n的代数式表示）.第1个图第2个图第3个图4、观察表一，寻找规律表二、表三、表四分别是从表一中截取的一部分，其中、的值分别为_ 5、如图是一块瓷砖的图案，用这种瓷砖来铺设地面如果铺成一个的正方形图案（如图），其中完整的圆共有5个，如果铺成一个的正方形图案（如图），其中完整的圆共有13个，如果铺成一个的正方形图案（如图），其中完整的圆共有25个若这样铺成一个的正方形图案， 则其中完整的圆共有 个 6、 如下图,用同样大小的黑、白两种颜色的棋子摆设如下图所示的正方形图案，则第n个图案需要用白色棋子 枚（用含有n的代数式表示，并写成最简形式）. 7、用火柴棒按下图中的方式搭图形，按照这种方式搭下去，搭第334个图形 需 根火柴棒。 8、将正整数按如图5所示的规律排列下去，若有序实数对（，）表示第排，从左到右第个数，如（，）表示实数，则表示实数的有序实数对是 第一排第二排第三排第四排610987321549、如图 ，用n表示等边三角形边上的小圆圈，f(n)表示这个三角形中小圆圈的总数，那么f(n)和n的关系是 10、观察图4的三角形数阵，则第50行的最后一个数是 （ ） 1 -2 3 -4 5 -6 7 -8 9 -10 。11、 下列图案由边长相等的黑、白两色正方形按一定规律拼接而成，依此规律，第n个图案中白色正方形的个数为_第一个第二个第三个第n个12、 观察下列各式： 猜想： （2013）16. 如下图，每一幅图中均含有若干个正方形，第1幅图中有1个正方形；第2幅图中有5个正方形；按这样的规律下去，第6幅图中有_个正方形。 （2011）15、如图6，这是边长为1的等边三角形摆出的一系列图形，按这种方式摆下去，第n个图形的周长为 .（2008）15观察表一，寻找规律表二、表三分别是从表一中选取的一部分，则a+b的值为 01231357258113711151114a111317 b表一 表二 表三答案解析：1解析：n=1时，m=5n再每增加一个数时，m就增加3个数解答：根据所给的具体数据，发现：8=5+3，11=5+32，14=5+33，以此类推，第n个圈中，m=5+3（n-1）=3n+22解析：分析可得：第1幅图中有12-1=1个，第2幅图中有22-1=3个，第3幅图中有32-1=5个，故第n幅图中共有2n-1个3解析：在4的基础上，依次多3个，得到第n个图中共有的棋子数观察图形，发现：在4的基础上，依次多3个即第n个图中有4+3（n-1）=3n+1当n=6时，即原式=19故第6个图形需棋子19枚4解析：此题只要找出截取表一的那部分，并找出其规律即可解解答：解：表二截取的是其中的一列：上下两个数字的差相等，所以a=15+3=18表三截取的是两行两列的相邻的四个数字：右边一列数字的差应比左边一列数字的差大1，所b=24+25-20+1=30表四中截取的是两行三列中的6个数字：18是3的6倍，则c应是4的7倍，即28故选D认真观察表格，熟知各个数字之间的关系：第一列是1，2，3，；第二列是对应第一列的2倍；等三列是对应第一列的3倍5解析：据给出的四个图形的规律可以知道，组成大正方形的每个小正方形上有一个完整的圆，因此圆的数目是大正方形边长的平方，每四个小正方形组成一个完整的圆，从而可得这样的圆是大正方形边长减1的平方，从而可得若这样铺成一个1010的正方形图案，则其中完整的圆共有102+（10-1）2=181个解答：解：分析可得完整的圆是大正方形的边长减1的平方，从而可知铺成一个1010的正方形图案中，完整的圆共有102+（10-1）2=181个点评：本题难度中等，考查探究图形的规律本题也只可以直接根据给出的四个图形中计数出的圆的个数，找出数字之间的规律得出答案6解析：解：第1个正方形图案有棋子共32=9枚，其中黑色棋子有12=1枚，白色棋子有（32-12）枚；第2个正方形图案有棋子共42=16枚，其中黑色棋子有22=4枚，白色棋子有（42-22）枚；由此可推出想第n个图案的白色棋子数为（n+2）2-n2=4（n+1）故第n个图案的白色棋子数为（n+2）2-n2=4（n+1）点评：根据图形提供的信息探索规律，是近几年较流行的一种探索规律型问题解决这类问题首先要从简单图形入手，抓住随着“编号”或“序号”增加时，后一个图形与前一个图形相比，在数量上增加（或倍数）情况的变化，找出数量上的变化规律，从而推出一般性的结论7解析：根据题意分析可得：搭第1个图形需12根火柴；搭第2个图形需12+61=18根；搭第3个图形需12+62=24根；搭第n个图形需12+6（n-1）=6n+6根解答：解：搭第334个图形需6334+6=2010根火柴棒8解析：寻找规律，然后解答每排的数字个数就是排数；且奇数排从左到右，从小到大，而偶数排从左到右，从大到小解答：解：观察图表可知：每排的数字个数就是排数；且奇数排从左到右，从小到大，而偶数排从左到右，从大到小实数15=1+2+3+4+5，则17在第6排，第5个位置，即其坐标为（6，5）故答案填：（6，5）对于找规律的题目首先应找出哪些部分发生了变化，是按照什么规律变化的9解析：根据题意分析可得：第n行有n个小圆圈故f（n）和n的关系是（n）= （n2+n）10解析：根据题意可得：第n行有n个数；且第n行第一个数的绝对值为 +1，最后一个数的绝对值为 +n；奇数为正，偶数为负；故第50行的最后一个数是1275解答：解：第n行第一个数的绝对值为 +1，最后一个数的绝对值为 +n，奇数为正，偶数为负，第50行的最后一个数是1275第一个图中白色正方形的个数为33-1；第二个图中白色正方形的个数为35-2第三个图中白色正方形的个数为37-3；当其为第n个时，白色正方形的个数为3（2n+1）-n=5n+312解析：根据所给的等式，可以发现右边的底数是前边的底数的和，指数是平方，则最后的底数是1+2+3+.+10=511=55，则原式=552解答：解：根据分析最后的底数是1+2+3+.+10=511=55，则原式=552故答案552德国教育家第斯多惠说：“教学的艺术不在于传授本领，而在于激励、唤醒、鼓舞。”当学生沉浸于“我能学好”的喜悦中时，必然会产生更强烈的主动求知的心理冲动plenary session, each session of the Central Committee of national institutions and personnel problems have been arranged, you can concentrate on national development and reforms. Previous plenary session is often branded with a central leading collective, often by looking at the third plenum of the initiative to found the current central leadership collective governance characteristics. From the analysis of the process of economic reform in China, plenary session, 12 session, 14, 16 plenary session have programmatic meaning, respectively, marking the four stages of Chinas economic reform, and that the start-up phase of reform, reform, construction phase and perfecting the Socialist market economy framework stage of socialist market economy. Previous plenary session topics proposed to the third plenary session of taking class struggle as the key link, shifted to socialist modernization; 12 session marked the change from rural to urban, established with public ownership as the Foundation of a planned commodity economy; 13 session at a time when both the old and the new system change, governance and rectify the economic order; 14 . Fair and efficient and authoritative Socialist judicial system, safeguard the peoples interests. Legal authority to uphold the Constitution, deepening the reform of administrative law enforcement, ensure that the right to exercise judicial power independently and impartially according to law the prosecution, perfecting the running mechanism of judicial power, improve the system of judicial protection of human rights. Plenary session, Affairs the right to adhere to the system, and let the people authority to let the power run in the Sun, is shut up in a cage of the system power policy. Decision Science, implementation should be constructed strong, supervise the running of powerful system, improve the system of punishing and preventing corruption, promoting political integrity, and strive to achieve cadres honest and Government integrity, clean politics. To form a scientific and effective coordination of power restriction and mechanisms to strengthen anti-corruption institutional innova