GRE真题答案，GRE真题答案详解_雷哥GRE
在考G的所有科目里，学长学姐甚至是机构老师可能都说GRE数学最简单， 是不是最简单？R妹明确告诉你——是的。GRE数学的难度属国内数学初高中水平，高中难度也绝对不会超过高二知识。但从GRE真题不乏看出，例如排列组合知识点，国内文科生没有学过，可能理解起来会稍稍费劲一些。
对于中国考生来说，GRE数学可谓是我们的“先天优势”项目，我们可以为此花费更少的时间也得到不错的分数，但这个“不错”仅建立在高于语文的基础上就满足了吗？绝对不行，我们要做的是数学拿高分甚至满分，即使做数学GRE真题时感到容易，但想取得168+的分数依然需要耗费巨大努力。
那么，GRE数学到底怎么练才好？练GRE真题。OG官方指南在众多GRE资料里，是比较基础，难度稍小的一类，但对GRE数学来说却是十分优秀的资料。要知道，数学的知识点就是那些，难在哪？对题目的理解。它可能会像一个脑筋急转弯一样，你一时半会怎么也想不出来，但绕过了这个弯，本质十分简单，来雷哥GRE练题的同学都大呼上当。
所以GRE真题和OG是我们数学取得高分不可或缺的法宝。GRE真题资料好找，GRE真题答案却不好找，获取到GRE真题答案的详细解析更是难上加难。
但是！这点事情对R妹来说还是小菜一碟~R妹特意邀请雷哥GRE数学满分学员训练师——Helen老师，为大家精选GRE真题并总结出GRE真题答案的详细解析，大家好好学习总结，试着从以下真题中揣摩ETS数学试题的出题套路。
1、In an xy-coordinate system,if line k intersects the y-axis at(0,6)and has a slope of -3,then k intersects the x-axis at
A (-2,0)
B (−1/2,0)
C (1/2,0)
D (2,0)
E (3,0)
答案.D
y=-3x+6
y=0时x=2
2、When a certain coin is flipped, the probability of heads is 0.5. If the coin is flipped 6 times, what is the probability that there are exactly 3 heads?
A 1/4
B 1/3
C 5/16
D 31/64
E 1/2
答案.C
P=C(6,3)(1/2)^6=5/16
3、A box contains 6 black balls and 4 white balls. If two balls are selected at random without replacement, what is the probability that both balls are white?
A.7/90
B.3/25
C.2/15
D.4/25
E.4/9
答案.C
设A=“第一次取出的是white”，B=“第二次取出的也是white”
P(A)=4/10=2/5
P(B)=3/9=1/3
P(AB)=P(A)P(B)=2/15
4、The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.25. If the probability that either event A or event B occurs is 0.6, what is the probability that event B will occur?
A 0.05
B 0.15
C 0.45
D 0.50
E 0.55
答案.C
P (A∪B) = P(A) + P(B)-P(A∩B)
P(B)=0.25+0.6-0.4=0.45
5、n how many different ways can 3 identical green shirts and 3 identical red shirts be distributed among 6 children such that each child receives a shirt?
A 20
B 40
C 216
D 720
E 729
答案.A
A(6,6)/[A(3,3)A(3,3)]=720/36=20
6、If square ABCD has area 25, and the area of the larger shaded square is 9 times the area of the smaller shaded square, what is the length of one side of the smaller shaded square?
Note: Figure not drawn to scale
A 3/4
B 5/4
C 6/5
D 4/3
E 5/3
答案.B
设阴影部分大正方形边长a,小正方形边长b
a+b=5
a^2=9b^2→a=3b
b=5/4
7、2x + y years ago, Roberto was 3x + y years old. How many years old was Roberto x years ago?
A x
B 4x+2y
C 5x+2y
D 6x+2y
E 6x+y
答案.B
现在：2x+y+3x+y=5x+2y
x年前：4x+2y
8、A box contains 4 red chips and 2 blue chips. If two chips are selected at random without replacement, what is the probability that the chips are different colors?
A 1/2
B 8/15
C 7/12
D 2/3
E 7/10
答案.B
P=[C(4,1)C(2,1)]/C(6,2)=8/15
以上就是雷哥GRE的Helen老师为大家精选的典型GRE真题，更多GRE学习备考可与R妹（LGGRE335）交流~你GRE学习路上的贴心小助手。
