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网络问题。
先检查下载的版本是否正确，如果版本出现错误可重新下载。也有可能是手机本身配置如内存不足的问题。这款游戏现在正处于公测期，非常火爆，所以也有可能是登陆的玩家太多，大家可以稍微等一等，多试着登陆几次，或者是等玩家高峰期过后再尝试登陆。

网络问题。
先检查下载的版本是否正确，如果版本出现错误可重新下载。也有可能是手机本身配置如内存不足的问题。这款游戏现在正处于公测期，非常火爆，所以也有可能是登陆的玩家太多，大家可以稍微等一等，多试着登陆几次，或者是等玩家高峰期过后再尝试登陆。

中文名《灭世》
外文名Revolution
《灭世》又名《革命》，美国科幻片，《灭世》讲述了世界末日之后所发生的诡异事件，所有的现代科技包括手机、电脑、汽车、飞机甚至电灯都神秘消失，那些幸存者为了寻找自己的爱人和亲人不得不通过自己的双手来谋求生活，他们开始使用那些冷兵器时代的武器（刀、棍、箭、弩等）来保护自己，剧中男主角Miles是一个神通广大的人物，他时而展现自己好的一面时而表现出来危险的一面，令人捉摸不透。Danny Matheson是有着一副好心肠心眼很多的猎人，这里有很多的角色，他们将如何生存，又将有怎样的冒险之旅呢？剧集描述了一场史诗般宏大充满惊险的冒险之旅，一家人在世界末日之后，历经千辛万苦试图重新重聚的故事，这个末日后世界只有一座座空城、驻扎当地的民间武装组织和一个个充满英雄主义的自由战士，在这里所有的现代科技都成了摆设，包括电脑、飞机、汽车、手机、甚至是电灯在内的所有东西都不能正常运作…而这种“现象”似乎是持续到永远的。

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Elementary school arithmetic, we know the natural numbers 1,2,3, … …, scores of 1 / 2, 2 / 3, … …, decimal 0.5,1.3, … …, pi π = 3.1415926 … …, the regular use these numbers to + ,-,×,÷ arithmetic. The mathematical symbols have bee our friends.

1 +2 mean? It can be said that a person with two people, you can also add two trees that a tree can also be said of other things. Mathematical symbols can represent a wide range of objective things, but also simple and practical. This is unmatched by other languages, is precisely the power of mathematical symbols and lies.

How many do mathematical symbols? Aording to statistics, the early, higher mathematics often used mathematical symbols are more than 200 secondary school mathematics often have more than 100 symbols.

Indicated that the number of letters and geometric symbols, called the element symbol. For example, with a, b, c, said datum, with x, y, z is the unknown; in proving two triangles congruent, the use (s, s, s) that correspond to the three sides are equal, (s, a, s) that are equal on both sides and the angle corresponding to, (a, s, a) said clip corners and edges corresponding to equal, and the ratio of circumference π, unit imaginary number i, the natural logarithm base e, are elements of these symbols. There are 1,2,3, 1 / 2, 2 / 3, 0.5,1.3, they are symbolic elements.

+,-,×,÷ Said that between the number of addition, subtraction, multiplication, division. This indicated that the rules of operation in aordance with a symbol called operation symbols. Two sets of sets (∪), intersection (∩), on the n to sum (∑ [1 ≤ k ≤ n] f (k)), indefinite integral (∫ f (x) δx), from a to b The definite integral (∫ [a: b] f (x) δx), these are operations symbols.

Equal sign (=), approximate equal sign (≈), does not mean No. (≠), greater than (>), less than (<), identity or congruence number (≡), similar number (≈), All the equal sign (≌), the number of these symbols, the relationship between type or graphics, called the relationship between symbols. There are parallel to the symbol (‖), the vertical symbol (⊥), than the symbols (:), are symbols (∈), these were all symbols.

In mathematics, there are a number of agreed symbols to indicate a specific meaning or formula. Because (∵), therefore (∴), n elements of m elements out the number of binations (C (n: m)), n elements in the arrangement of elements out m the number of (A (n: m)), These symbols are called conventions.

Some symbols, such as parentheses (()), square brackets ([]), braces (()) and so called auxiliary symbols, also called bined symbols.
Mathematics in the world is really a sign of things in the world!

How the kind of mathematical symbols from?

China is a cultural development on the public sector, one of the earliest countries. Digital mathematical elements of this symbol, as early as two thousand years BC produced in China. Han Liu Xiang to write a book “The World” in just such a word: “Yellow Emperor, the scribe’s first prehensive and balanced.” About a thousand years BC, written by Wen Wang Zhougong “Yi Jing” in there “Ancient guitar string and rule, later writing saints and Yi Qi” records.

In algebra, the first use of a set of mathematical symbols, generally considered to be ancient Greek’s Diophantine all (Diophantus, BC 330-246). Descendants known as the abbreviation of his algebra algebra, while the ancient Egypt, ancient Babylonians algebra called the algebra described in the text. This text describes the algebra, has been delayed to the European Renaissance.

15 century, in Germany Wagenieer and Weidman’s work, the first to use “+” and “-” The two symbols, that the weight of the box “earnings” and “loss.” After which they were used plus and minus mathematician. “×” number is the 17-century British mathematician Oude Lai first use. “÷” number is the 17 century, created by the Swiss Larne.

“=” Was a British Liekeerde in the paper “theoretical wisdom stone” raised. Square brackets [] and braces () is a French mathematician Vieta (Verte ,1540-1603) introduced. “:” Is the French mathematician Descartes (Descartes ,1506-1650) first used. ∽, ≌ and dx (derivative), a German mathematician Leibniz (Leibniz ,1646-1716) creative use.
Derivative symbol “f1 (x)”, “y1” is the French mathematician Lagrange (Lagrange ,1736-1813) created by the indefinite integral “∫” treasure Bernoulli Swiss mathematician first use, the definite integral “∫ [a: b] f (x) δx “(written here is the work) is a French mathematician Depots (Foueer ,1768-1830) invented.

Swiss mathematician Euler (Euler ,1707-1783) to create a lot of life mathematical symbols, such as π, e, sin, cos, tan, ∑, f (x) and so on. French mathematician Cauchy (Cauchy ,1789-1857) is also a sign master, the determinant of the two vertical lines that he introduced in 1841.

The long list of the , shows the origins of mathematics part of the symbol. As can be seen, mathematical symbols is a product of collective human wisdom, is a mathematician of great efforts from generation to generation.
Development of science, constantly new demands of mathematics. The development of mathematics, the continuous generation of new mathematical symbols, while phasing out those not applicable mathematical symbols. As

The ancient Chinese also have their own set of mathematical symbols, in history has played a positive role. However, pared with the West, since the plex were not easy to apply. For example, in general the new algebra textbook (1905) is still the unknown x, y, z written in heaven, earth, human, the datum a, b, c written as A, B, C, the numbers 1,2,3 written in one, two, three. In this symbolic system, originally written in very general algebraic form of a very plicated inprehensible.

This of course is out of the list symbol. China’s systematic use of modern mathematical symbols, is in the 1911 Revolution (1910) followed. 1919 “54” campaign later pletely universal.

Modern mathematical symbols, because of its established meaning, expressing simple, easy to use, greatly promoted the development of mathematics. In mathematics, some people called the genius of the period of the seventeenth century, the eighteenth century, a period called the invention, in these two centuries, why the greater development of mathematics and achieved great acplishments? The reason, I am afraid that with the creation of a large number of mathematical symbols is not without close contact.

Some experts even point out that the leading Chinese ancient mathematics, modern mathematics behind, one of the reasons is that China does not use advanced mathematical symbols, which hindered the development of mathematics. Although these words are biased side, but it does points to the development of mathematical symbols of mathematics can play an important role!

Powerful mathematical symbols, magical. It is the mathematics in the special “Text”, recording and transmission of rich mathematical information, it is silent note, in people’s heart of hearts bring out the beautiful music, it is the rigorous mathematical theory of esoteric “source” of 1, moistens the flower of civilization. As a middle school student, please attach importance to the study of mathematical symbols reference to it! The only way to make our thinking more agile, precise and profound