GRE 考试技巧
一、数学考察的范围
1. Arithmetic算术部分包括整数的性质和种类，比如整除性、因子分解、质数、余数、奇数偶数;算术运算、指数、根;估算、百分比、比、比率、绝对值、数轴、小数表达、数列。
2. Algebra代数包括指数运算;因式分解、简化代数式;函数、等式、不等式;解一次方程和二次方程、解不等式;解联立方程、方程组;用方程解决文字题;解析几何、函数图像、函数图像解方程和不等式、截距、斜率。
3. Geometry几何包括平行、垂直、圆、三角形、等腰三角形、等边三角形、306090三角形、四边形、其他多边形、全等和相似图形、三维图形、面积、周长、体积、毕达哥拉斯定理、角度计算。不考察证明的能力。
4. Data analysis包括描述统计学比如平均数、中位数、众数、极差、均方差、四分位差、四分位、百分位;分析图和表，包括折线图、柱状图、饼图、箱型图、散点图、频数分布;概率初步、合成事件、独立事件、随机变量、概率分布、正态分布;计数方法、排列、组合、维恩图。不考推论统计。
二、数学考察的题型
四种题型：
1. 数值比较quantitative comparison questions
2. 单选题 multiple-choice questions----select one answer choice
3. 多选题 multiple-choice questions----select one or more answer choices
4. 数值输入题 numeric entry questions
三、答题的注意事项
1. become familiar with the answer choices.
2. avoid unnecessary computations.
3. remember that geometric figures are not necessarily drawn to scale.
4. plug in numbers
5. simplify the comparison
6. use the fact that the answer is there.
7. examine the answer choices
8. for questions that require approximations, scan the answer choices to see how close an approximation is needed.
9. note whether you are asked to indicate a specific number of answer choice or all choices that apply.
10. in some questions that involve conditions that limit the possible values of numerical answer choices, it may be efficient to determine the least and/or the greatest possible value.
11. avoid lengthy calculations by recognizing and continuing numerical patterns.
12. make sure you answer the question that is asked.
13. if you are asked to round your answer, make sure you round to the required degree of accuracy.
14. examine your answer to see if it is reasonable with respect to the information given.
15. 填空题几个注意：1要先点选输入框 2删除要用backspace 3负号就用那个连词符号 4如果要改成正的，再次输入连词符号就变成正数了 5计算器上的transfer display可以直接把计算器里得出的结果转到输入框里面 6 2.5和2.50是一样的 7 除非要求四舍五入，否则不要输入近似值 8如果是分数，一般分子和分母是两个独立的框 9分数不必须约分
16. scan the data presentation briefly to see what it is about, but do not spend time studying all of the information in detail
17. bar graphs and circle graphs, as well as other graphical displays of data, are drawn to scale, so you can read or estimate data visually from such graphs.
18. the questions are to be answered only on the basis of the data presented, everyday facts (such as the number of days in a year), and your knowledge of mathematics.
19. MR表示 memory recall, M+ 表示memory sum, MC 表示 memory clear.
20. 当第一次按M+，屏幕上显示的数字被纪录在计算器的内存里面，屏幕右边出现M字母，表示内存记忆被使用。以后每一次按M+按键，都会把当前的屏幕上显示的数字加到内存的数字上，并以得到的和来取代原来内存的记忆值。当按MR按键的时候，内存里面记忆的值被调出，就是最后的结果。如果要清空内存，按MC按键，这个时候右边的M标志就消失了
四、需要知道的数学常识
1. 都是实数，没有虚数
2. 10进制，除非另外说明。
3. billion是10的9次方，dozen是12个，π是3.14近似
4. 23.5近似到各位是24, 123.985近似到百分位是123.99, -36.5近似到各位是-37
5. 循环小数的循环节上画一个横线。
6. factor因子，可正可负，因子一般都是整数，倍数不一定
7. 最小公倍数和最大公约数
8. 余数、被除数、除数、商的定义
9. 质数的定义
10. 奇数偶数不一定是正数
11. 0既不是正的，也不是负的
12. 小于等于、大于等于、约等于、不等于、绝对值、平方根、阶乘、平行、垂直等的符号需要知道
13. 没有定义的情况：分母为0,根号下面为负数，0的0次方
14. 有时候，字母摆在一起不表示乘法，比如consider a three-digit integer denoted by XYZ, where X, Y, and Z are digits.
15. 如果一个函数的定义域没有明说，那么就默认是整个实数范围，复合函数会考。
16. 只考欧几里德平面，三角形内角和180
17. 直线没有端点
18. 多边形是凸的，闭合的
19. 解析几何一般都是按照比例画的
20. nonempty sets, empty set, intersection, union, disjoint sets or mutually exclusive sets
21. the integers from 0 to 9, inclusive。 包括了10个元素，而during the years from 1985 to 2005 不管说不说inclusive 都包括了21年
22. measures of central tendency, measures of position, measures of dispersion
23. 如果有偶数个数，那么median表示按照升序排列的这串数字的中间两个数的算术平均
24. mode可以不只一个
25. quartile可以指那个点，也可以指一个区，比如the cow’s weight is in the third quartile of the weights of the herd 这个时候quartile 就是指一个区域group
26. 25th percentile = the first quartile; the 50th percentile equals the second quartile, or median; the 75th percentile equals the third quartile.
27. standard deviation of the data refers to the nonnegative square root of the mean of the squared differences between m and each of the data. also known as the population standard deviation and is not to be confused with the sample standard deviation. Sample standard deviation is divided by n-1 for technical reasons.
28. frequency distribution
29. relative frequency distributions
30. the mean of the random variable X is the sum of the products XP(X) for all values of X.
31. the mean of a random variable X is also called the expected value of X or the mean of the probability distribution of X
32. In any group of data, most of the data are within about 3 standard deviations above or below the mean.
33. The process of subtracting the mean from each value and then dividing the result by the standard deviation is called standardization. It's a useful tool because for each data value, it provides a measure of position relative to the rest of the data independently of the variable for which the data was collected and the units of the variable.
34. universal set
35. median 把曲线下面的面积平均分成两块面积相等的部分，mean要算上这块面积的重量，所以og上那个图的mean要在median的右边，因为越往右，越重
36. 所以median是halving point, 而mean is the balance point
37. box-and-whisker plot 5个点L Q1 Q2 Q3 G 可以立刻看到median, interquartile range and range.
38. 正态分布：2%，14%，34%，34%，14%，2%
GRE考试报名最新攻略
笔考地点
10183–Beijing, Peking University
10261–Beijing, Beijing Technology and Business University
10262–Beijing, Beijing University of Aeronautics and Astronautics
10520–Beijing, Beijing Language and Culture University
10604–Beijing, Tsinghua University
10605–Beijing, Beijing Capital Normal University
10606–Beijing, Beijing Foreign Studies University
10609–Beijing, Beijing Normal University
10265–Changsha, Hunan University
10122–Chengdu, Sichuan University
10138–Chongqing, Sichuan Foreign Language Institute
10169–Dalian, Dalian Foreign Language Institute
10139–Guangzhou, Guangzhou Foreign Language & Trade Univ.
10237–Hangzhou, Hangzhou Institute of Commerce
10244–Harbin, Heilongjiang University
10253–Hefei, University of Science and Technology
10292–Jinan, Shandong University
10319–Kunming, Yunnan University
10453–Nanchang, Jiangxi Normal University
10428–Nanjing, Nanjing University
10513–Shanghai, Jiaotong University
10607–Shanghai, East China Normal University
10610–Shanghai, Shanghai International Studies University
10264–Shenzhen, Shenzhen University
10621–Tianjin, Tianjin University
10517–Urumqi, Xinjiang University
10641–Wuhan, Wuhan University
10685–Wuhan, Huazhong University of Science and Technology
10642–Xiamen, Xiamen University
10688–Xian, Xian Foreign Language Institute