新GRE數學考試有哪些重要考點
考生在備考新GRE考試時，有必要知道一些重要的考點是關于新GRE的數學部分的。下面我們就來看看新GRE數學考試的.幾大重要考點，歡迎大家閱讀!
新GRE數學的重要考點：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數學的重要易錯題
1. n個數從小到大排列，求(n-1)/4，設商為i，余數為j ,則可求得1st Quartile為：(第i+1個數)*(4-j)/4+(第i+2個數)*j/4
2. 4個*，2個·的排列方式 15(=)
3 .5雙襪子，同時去2只，剛好配對的概率。1/9
4. 40人說French,60人說Russian,80人說Italy,說兩種語言的有50人，說三種語言的有 10人. 共有125人,問不說這些語言的有幾人。Key：125-(40+60+80-50-10*2)=15
5 .等腰直角三角形邊長2加2倍根號2，求面積。
6. 某種溶液濃度為125gram per liter, 轉換成 ounce per gallon,求表達式.已知 1 ounce=28.xxx gram and 1
gallon=3.875 liter
7. x,y,z 均方差為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,問是1或是2或是both的概率,1-0.6*0.8(數字瞎編)=0.92.
9. 還有一組測量數據中,12.1比mean低1.5個標準差,17.5比mean高3.0個標準方差.問mean是多少.13.9(設標準差為X 12.1+1.5X=M，17.5-3X=M)
10. 圖表題,1992年總和是50,96年是60,每年至少增長1,問最大的年增長：7.0
GRE數學考試重點術語
2^5=the fifth power of 2
abscissa 橫坐標
ordinate 縱坐標
quadrant 象限
coordinate 坐標
slope 斜率
intercede 截距(有正負之分)
solution (方程的)解
arithmetic progression 等差數列(等差級數)
an=an+(n-1)d s=1/2(a1+an)
common divisor 公約數
common factor 公因子
least common multiple 最小公倍數
composite numbe 合數
prime factor 質因子
prime number 質數
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