GRE真题答案解析_雷哥GRE.pdf

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1、欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将竭诚为您提供优质的文档！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。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-

2、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、 欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将竭诚为您提供优质的文档！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

4、/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(AB)=P(A)+P(B)-P

5、(AB)P(B)=0.25+0.6-0.4=0.45 欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将竭诚为您提供优质的文档！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 squa

6、re 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 欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将

7、竭诚为您提供优质的文档！a2=9b2a=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