新GRE数学考试有哪些重要考点

考生在备考新GRE考试时，有必要知道一些重要的考点是关于新GRE的数学部分的。下面我们就来看看新GRE数学考试的几大重要考点，欢迎大家阅读!

　　新GRE数学的重要考点：并集和交集

Intersection of Sets

Intersection of two sets is another set with only the members that are in both sets. If the two sets do not share any common member, the intersection is the empty set with no member.

Example:

Intersection of {1,2,3} and {2,3,5} is the set {2,3}.

Intersection of the set with all primes and the set with all even numbers is the set {2} since only 2 is both even and prime.

Intersection of {1,2,3} and {4,5,6} is the empty set {}.

Remember:

Intersection contains only the common members.

Two sets are disjoint if they have no member in common, that is they have an empty intersection.

Union of Sets

Union of two sets is another set with all the members from both sets.

Example:

Union of {2,3,5} and {1,3,4} is the set {1,2,3,4,5}.

Union of {1,2,1} and {1,2} is the set {1,2,1}.

Remember:

The common members do not repeat in the union.

　　新GRE数学的重要易错题

1. n个数从小到大排列，求(n-1)/4，设商为i，余数为j ,则可求得1st Quartile为：(第i+1个数)*(4-j)/4+(第i+2个数)*j/4

2. 4个*，2个·的排列方式 15(=)

3 .5双袜子，同时去2只，刚好配对的概率。1/9

4. 40人说French,60人说Russian,80人说Italy,说两种语言的有50人，说三种语言的有 10人. 共有125人,问不说这些语言的`有几人。Key：125-(40+60+80-50-10*2)=15

5 .等腰直角三角形边长2加2倍根号2，求面积。

6. 某种溶液浓度为125gram per liter, 转换成 ounce per gallon,求表达式.已知 1 ounce= gram and 1

gallon=3.875 liter

7. x,y,z 均方差为d, 求x+10,y+10,z+10的均方差 (d)

8. 1的概率是0.8,2的概率是0,6,问是1或是2或是both的概率,1-0.6*0.8(数字瞎编)=0.92.

9. 还有一组测量数据中,12.1比mean低1.5个标准差,17.5比mean高3.0个标准方差.问mean是多少.13.9(设标准差为X　12.1+1.5X=M，17.5-3X=M)

10. 图表题,1992年总和是50,96年是60,每年至少增长1,问最大的年增长：7.0

　　GRE数学考试重点术语

2^5=the fifth power of 2

abscissa 横坐标

ordinate 纵坐标

quadrant 象限

coordinate 坐标

slope 斜率

intercede 截距(有正负之分)

solution (方程的)解

arithmetic progression 等差数列(等差级数)

an=an+(n-1)d s=1/2(a1+an)

common divisor 公约数

common factor 公因子

least common multiple 最小公倍数

composite numbe 合数

prime factor 质因子

prime number 质数

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