GRE机经的使用分为两个阶段，一个是对以往机经的整理分类，另一个是要对整理好的GRE机经做一个细化以及记忆的过程。所以今天小编为考生带来2016年2月26号GRE北美数学预测机经，希望对考生备考GRE有所帮助。
1. w + x + y = 21
Column A Column B
Average of x and y 7
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
解析：D
因为无法确定w的值是多少，所以也无法确定x+y的值是多少，因此也无法确定x+y的平均值，所以选择D.
2. The greatest prime factor of 144 is x
The greatest prime factor of 96 is y
Column A Column B
x y
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
解析：C
144最大的质因数为3，96最大的质因数也是3，因此选C.
3. Set A:{0.2, 0.4, 0.6, 0.8}
Set B:{2, 4, 6, 8}
Column A Column B
Standard deviation of set A Standard deviation of set B
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
解析：B
求A和B的标准偏差。
A： =(0.2+0.4+0.6+0.8)/4=0.5
=[(0.2-0.5)2 +(0.4-0.5)2 +(0.6-0.5)2+(0.8-0.5)2]/(4-1)=
S=
B: =(2+4+6+8)/4=5
=[(2-5)2 +(4-5)2 +(6-5)2 +(8-5)2]/(4-1)=
S=
所以A
4. For all numbers x and y, the operation* is defined by x*y = (x+y)(x-y) + (y-x)(y+x) +xy. What is the value of (square root 12)* (square root 3) ?
A. 6
B. 12
C. 18
D. 24
E. 36
解析：A
因为x*y = (x+y)(x-y) + (y-x)(y+x) +xy，所以x*y= - = * = =6，所以选A.
5. y = 5 x 6 x 14 x 15
Column A Column B
Remainder when y is divided by 18 Remainder when y is divided by 40
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
解析：B
Y= 5 x 6x 14 x 15=6300. 6300/18=350,余数为0.6300/40=157,余数20. 所以B更大。
6. x and y are prime numbers and x + y = 18
Column A Column B
xy 70
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
解析：B
因为x和y都是质数，且x+y=18, 所以x和y一个是11，一个是7，所以xy=77.
比70大，所以选B.
7.
Column A Column B
a + b c + d
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
解析：A
因为三角形内角和为180度，所以a+b=180-e, c+d=180-f. 很明显，e为锐角，f为钝角，所以ec+d,所以选A.更多GRE备考信息请登录前程百利GRE考试网站或拨打前程百利GRE考试热线400-890-6000咨询,或者关注GRE满分公众号(ID：bailiedu-gre)。
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