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GRE數(shù)學(xué)考試算術(shù)題精選例題.

2017/08/09 07:02:01 編輯: 瀏覽次數(shù):78 移動端

  GRE數(shù)學(xué)考試對于我們來說并不是很難,只要認真?zhèn)淇?,取得高分甚至滿分都是有可能的。以下是6道新GRE數(shù)學(xué)考試算術(shù)題精選例題,希望各位考生認真練習,并從中總結(jié)出做題方法。

  獲得更多留學(xué)知識 請咨詢澳際免費在線顧問

  例題1

  A,B,C,D,E,F排在1,2,3,4,5,6六個位置上,問A不在1, B不在2, C不在3的情況下,共有多少種排法?

  (A) 720

  (B) 450

  (C) 180

  (D) 216

  (E) 320

  例題2

  一直線L過點A(5,0), B(0,2), 坐標原點為O, 點P(X,Y)為三角形OAB中一點, 問:Y

  (A) 1/4

  (B) 3/8

  (C) 1/2

  (D) 5/8

  (E) 3/4

  例題3

  In an insurance company, each policy has a paper record and an electric record.For those policies having incorrect paper record, 60% also having incorrect electric record; For policies having incorrect electric record, 75% also having incorrect paper record.3% of all policies have both incorrect paper and incorrect electric records.If we randomly pick out one policy,what’s the probability that the one having both correct paper and correct electric records?

  (A) 0.80

  (B) 0.94

  (C) 0.75

  (D) 0.88

  (E) 0.92

  例題4

  If Bob can do a job in 20 days and Jane can do the job in 30 days, they work together to do this job and in this period, Bob stop work for 2.5 days and Jane stop work for x days, and the job be finished for 14 days, what is x?

  (A) 1.6

  (B) 3.2

  (C) 1.5

  (D) 1.25

  (E) 1.15

  例題5

  The probability of A is 60% and the probability of B is 50%, what is the most possible probability that neither A nor B would happen?

  (A) 0.80

  (B) 0.40

  (C) 0.75

  (D) 0.55

  (E) 0.68

  例題6

  There are 1200 respondents to a poll, each favoring their prerence for candidates A,B, and C.54% favored A, 48% favored B, and 42% favored C, and there is 30% favored both A and B.what’s the largest possible number of respondents favoring C, but not C&B, nor C&A?

  (A) 25%

  (B) 30%

  (C) 28%

  (D) 38%

  (E) 40%

  參考答案:

  1.解:首先考慮總的可能性為,再考慮A在1,B在2,C在3的可能性分別為,中重復(fù)計算了三者交集,分別為AB在1,2,AC在1,3,BC在2,3,所需將三種情況加回,即,但考慮這三種加回的交集又重復(fù)計算了ABC在1,2,3的情況,所以應(yīng)減去P33

  2.解:在平面直角坐標系中,T

  3.解:設(shè)總數(shù)為x,設(shè)incorrect paper record有y, incorrect electric record有z,則:

  x·y·60%=3%·x y=5%

  x·z·75%=3%·x z=4%

  則,兩者至少有一個錯誤的百分比為5%+4%-3%=6%,所正確答案為94%

  4.解:1/20(14-2.5)+1/30(14-x)=1,得出x=1.25

  5.解:劃出圖表來可以一目了然:A, B均不發(fā)生的最大概率為40%,最小概率為0.

  6.解:A和B的并集為:54%+48%-30%=72%,所C為28%.

  以上便是GRE數(shù)學(xué)考試算術(shù)題的6個例題推薦,各位考生可以通過這些例題來練筆,熟悉GRE數(shù)學(xué)題的風格。大家不能認為GRE數(shù)學(xué)考試簡單就因此而輕敵,應(yīng)對任何考試都需要認真的備考以及積極正確的心態(tài),這是很重要的。

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