准备gre数学考试我们一定要在gre数学复习中把基础打牢靠，什么才是gre数学的基础呢?比如gre数学公式是大家一定要熟记于心的，澳际留学小编下面为大家分享一些关于算数的gre数学考点知识，供大家参考，希望可以帮助大家提高gre数学成绩。

　　GRE数学相当于中国高中数学的水平，对我国考生来说没有太大的问题，考生需要做得是不断巩固数学和语言基础，以防在最简单的部分出错。澳际留学小编下面为大家分享一下关于算数方面的gre数学考点，希望对您gre数学复习有所帮助。

　　1.Sum of Arithmetic Progression(等差数列求和)

　　The sum of n-numbers of an arithmetic progression is given by

　　S=nx*dn(n-1)/2

　　where x is the first number and d is the constant increment.

　　example:

　　sum of first 10 positive odd numbers:10*1+2*10*9/2=10+90=100

　　sum of first 10 multiples of 7 starting at 7： 10*7+7*10*9/2=70+315=385

　　remember:

　　For a descending AP the constant difference is negative.

　　2.AP(等差数列求平均数)

　　Average of n numbers of arithmetic progression (AP) is the average of the smallest and the largest number of them. The average of m number can also be written as x + d(m-1)/2.

　　Example:

　　The average of all integers from 1 to 5 is (1+5)/2=3

　　The average of all odd numbers from 3 to 3135 is (3+3135)/2=1569

　　The average of all multiples of 7 from 14 to 126 is (14+126)/2=70

　　remember:

　　Make sure no number is missing in the middle.

　　With more numbers, average of an ascending AP increases.

　　With more numbers, average of a descending AP decreases.

　　AP:numbers from sum

　　given the sum s of m numbers of an AP with constant increment d, the numbers in the set can be calculated as follows:

　　the first number x = s/m - d(m-1)/2,and the n-th number is s/m + d(2n-m-1)/2.

　　Example:

　　if the sum of 7 consecutive even numbers is 70, then the first number x = 70/7 - 2(7-1)/2 = 10 - 6 = 4.

　　the last number (n=m=7)is 70/7+2(2*7-7-1)/2=10+6=16.the set is the even numbers from 4 to 16.

　　Remember:

　　given the first number x, it is easy to calculate other numbers using the formula for n-th number: x+(n-1)

　　AP:numbers from average

　　all m numbers of an AP can be calculated from the average. the first number x = c-d(m-1)/2， and the n-th number is c+d(2n-m-1)/2, where c is the average of m numbers.

　　Example:

　　if the average of 15 consecutive integers is 20, then the first number x=20-1*(15-1)/2=20-7=13 and the last number (n=m=15) is 20+1*(2*15-15-1)/2=20+7=27.

　　if the average of 33 consecutive odd numbers is 67, then the first number x=67-2*(33-1)/2=67-32=35 and the last number (n=m=33) is 67+2*(2*33-33-1)/2=67+32=99.

　　Remember:

　　sum of the m numbers is c*m,where c is the average.

　　3.Sequence of Numbers(序列)

　　A sequence is a set of numbers that follow a fixed pattern.The fixed pattern can be expressed by an equation or by a property.

　　Example:

　　A set of consecutive integers: 1,2,3,4,5(Fixed gap)

　　A set of consecutive even numbers:4,6,8,10,12 (Fixed gap)

　　A set of consecutive prime: 2,3,5,7,11(Fixed gap)

　　A set of consecutive power of 2:4,8,16,32,64(Fixed gap)

　　Remember:

　　A sequence can be in ascending or descending order.

　　上面的信息就是澳际留学小编为大家介绍的一些关于算数的gre数学考点，大家在gre数学复习中可以参考学习下，希望对您提高gre数学成绩有所帮助，大家想了解更多信息请关注澳际留学，有问题可以咨询澳际在线顾问老师，我们竭诚为您解答。

　　澳际留学专家提醒大家：

　　澳际培训在国内首家推出专职“学习规划师”和“留学规划师”制度，对学生全程规划、全程跟踪，全程反馈。我们汇聚了国内外顶级名师，平均教学经验在5年以上，并实行八对一尊享服务——课程规划师，留学规划师，阅读教师，写作教师，听力教师，口语教师，语法教师，词汇教师等八位一体。完善的留学服务保证，整合了十年留学服务经验，让我们能将一流培训和申请服务全程有机结合。澳际50%学子都获得TOEFL 100和SAT 2000以上的分数。

　　澳际六步曲第二步考试指导具体服务项目如下：

　　1. 免费测评模考，分析申请人的问题，制作考试测评报告和备考指导

　　2. 结合申请人的申请目标和考试基础，制定考试整体规划及时间安排

　　3. 提供对申请人有帮助的考试经验和机经等

　　4. 根据需要提供免费口语模拟和指导服务

　　5. 免费修改作文4篇

　　6. 考前心理指导，调整考前心理状态

　　(注：口语模拟和作文修改服务提供时间为每年2月28日-8月1日)

更多出国留学最新动态，敬请关注澳际教育手机端网站，并可拨打咨询热线：400-601-0022