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GRE數(shù)學(xué)想考滿分？這6大失分點(diǎn)要關(guān)注
時(shí)間：2020-08-11
來(lái)源：網(wǎng)絡(luò)
作者：admin
相較于Verbal，GRE的Quantitative部分是絕大多數(shù)同學(xué)的得分利器，大家的目標(biāo)也基本都鎖定在168+，甚至于滿分。雖然GRE數(shù)學(xué)考察的內(nèi)容相對(duì)來(lái)說(shuō)比較容易，但想要考一個(gè)滿分也并不如想象中的那么輕而易舉。尤其近年來(lái)，難題、坑題出現(xiàn)的頻率逐漸變高，考生在考場(chǎng)上一不小心就會(huì)失分。
一、沒(méi)有仔細(xì)讀題
例題
Of the students in a school, 20 percent are in the science club and 30 percent are in the band. If 25 percent of the students in the school are in the band but are not in the science club, what percent of the students who are in the science club are not in the band?
A. 5% B. 20% C. 25% D. 60% E. 75%
比如上面這題,問(wèn)的是在science club的學(xué)生中不在band里面的百分比, 所以得用15%/20%=75%, 而不是直接等于15%.
二、幾何題中主觀做出題目沒(méi)給出的假設(shè)
例題：∠C=89°.
Quantity A: Length of AB
Quantity B: Length of BC
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from the information given.
答案是D，因?yàn)樵贕RE數(shù)學(xué)考試中并不保證圖形會(huì)按照相應(yīng)的比例繪制：there’s no guarantee that a figure will be drawn to scale on the GRE.
三、忘記 0 和 1
例題：If x is an odd negative integer and y is an even integer, which of the following statements must be true?
I. (3x - 2y) is odd
II. xy2 is an even negative integer
III. (y2-x) is an odd negative integer
A. I only
B. II only
C. I and II
D. I and III
E. II and III
答案: A. 容易錯(cuò)選C, 如果y是0, xy^2就不是negative integer.
四、忘記最小的質(zhì)數(shù)
例題
n is an even integer.
Quantity A: The number of prime factors of n
Quantity B: The number of prime factors of n/2
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D.The relationship cannot be determined from the information given.
答案: D. 最小的質(zhì)數(shù)是2,也是唯一的偶數(shù)。當(dāng)n=2 的時(shí)候, Quantity A 是一個(gè)prime factor, Quantity B是0個(gè)prime factor當(dāng)n=4的時(shí)候, Quantity A和Quantity B相等
五、沒(méi)有區(qū)分“must be” and “could be”
例題
c and d are prime numbers. If c – d is an odd integer, then which of the following must be true?
A) c is even
B) d is odd
C) c*d is odd
D) d is even
E) c*d +1 is odd
因?yàn)閏和d都是prime且要滿足c-d是odd, 說(shuō)明c和d一個(gè)是odd, 一個(gè)是even. 在所有prime中只有2是even, 所以c和d中一定有一個(gè)是2. 選項(xiàng)中 A,B,D都是could be true, C選項(xiàng) c*d 一定是even. 所以答案選E.
Must be = Always correct
Could be = answer only holds true in certain instances
六、沒(méi)有注意符號(hào)單位
例題
Quantity A: 0.05 percent of 4000
Quantity B: 1/200 of 4000
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from the information given.
計(jì)算的時(shí)候 percent 需要除以100, 所以0.05 percent of 4000= 0.05*4000/100 = 2, 所以答案選B。
遇到以上六種情況，同學(xué)們一定要保持警惕、多多思考。找出陷阱，直擊正確選項(xiàng)！
一、沒(méi)有仔細(xì)讀題
例題
Of the students in a school, 20 percent are in the science club and 30 percent are in the band. If 25 percent of the students in the school are in the band but are not in the science club, what percent of the students who are in the science club are not in the band?
A. 5% B. 20% C. 25% D. 60% E. 75%
比如上面這題,問(wèn)的是在science club的學(xué)生中不在band里面的百分比, 所以得用15%/20%=75%, 而不是直接等于15%.
二、幾何題中主觀做出題目沒(méi)給出的假設(shè)
例題：∠C=89°.
Quantity B: Length of BC
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from the information given.
答案是D，因?yàn)樵贕RE數(shù)學(xué)考試中并不保證圖形會(huì)按照相應(yīng)的比例繪制：there’s no guarantee that a figure will be drawn to scale on the GRE.
三、忘記 0 和 1
例題：If x is an odd negative integer and y is an even integer, which of the following statements must be true?
I. (3x - 2y) is odd
II. xy2 is an even negative integer
III. (y2-x) is an odd negative integer
A. I only
B. II only
C. I and II
D. I and III
E. II and III
答案: A. 容易錯(cuò)選C, 如果y是0, xy^2就不是negative integer.
四、忘記最小的質(zhì)數(shù)
例題
n is an even integer.
Quantity A: The number of prime factors of n
Quantity B: The number of prime factors of n/2
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D.The relationship cannot be determined from the information given.
答案: D. 最小的質(zhì)數(shù)是2,也是唯一的偶數(shù)。當(dāng)n=2 的時(shí)候, Quantity A 是一個(gè)prime factor, Quantity B是0個(gè)prime factor當(dāng)n=4的時(shí)候, Quantity A和Quantity B相等
五、沒(méi)有區(qū)分“must be” and “could be”
例題
c and d are prime numbers. If c – d is an odd integer, then which of the following must be true?
A) c is even
B) d is odd
C) c*d is odd
D) d is even
E) c*d +1 is odd
因?yàn)閏和d都是prime且要滿足c-d是odd, 說(shuō)明c和d一個(gè)是odd, 一個(gè)是even. 在所有prime中只有2是even, 所以c和d中一定有一個(gè)是2. 選項(xiàng)中 A,B,D都是could be true, C選項(xiàng) c*d 一定是even. 所以答案選E.
Must be = Always correct
Could be = answer only holds true in certain instances
六、沒(méi)有注意符號(hào)單位
例題
Quantity A: 0.05 percent of 4000
Quantity B: 1/200 of 4000
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from the information given.
計(jì)算的時(shí)候 percent 需要除以100, 所以0.05 percent of 4000= 0.05*4000/100 = 2, 所以答案選B。
遇到以上六種情況，同學(xué)們一定要保持警惕、多多思考。找出陷阱，直擊正確選項(xiàng)！
