2016年12月18日GRE數(shù)學(xué)機(jī)經(jīng)預(yù)測(cè)

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    12月18日的GRE考試馬上就要開始了,出國(guó)留學(xué)網(wǎng)GRE欄目為大家整理了“2016年12月18日GRE數(shù)學(xué)機(jī)經(jīng)預(yù)測(cè)”,預(yù)祝考生取得理想成績(jī)哦!
    題目
    1. The roots of the equation x^2 - x - 6 = 0 are
    A, 1 and - 5
    B. 2 and - 3
    C. 3 and - 2
    D. 5 and - 1
    E. none of the above
    答案:C
    解析:方程式可轉(zhuǎn)變?yōu)?x-3)(x+2)=0, roots也就是方式的根即為3和-2。
    2. Quantity A:The least prime number greater than 24
    Quantity B:The greatest prime number less than 28
    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:A
    解析:大于24的最小質(zhì)數(shù)為29,而B的任何一個(gè)數(shù)字都小于28,因此選A。
    3. Quantity A:54% of 360
    Quantity B:150
    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:A
    解析:無需具體計(jì)算A,大致計(jì)算360的50%為180大于B即可。
    Quantity A:PS
    Quantity B:SR
    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
    解析:根據(jù)條件可知三角形為等腰三角形,但缺乏其它條件因此無法判斷PS和SR的長(zhǎng)度,無從比較,所以選D。
    5. A merchant made a profit of $5 on the sale of a sweater that cost the merchant $15. What is the profit expressed as a percent of the merchant’s cost? Give your answer to the nearest whole percent.
    答案:33%
    解析:賣了件cost15塊的衣服,賺到了5元profit,求profit和cost的百分比,也就是5/15,因?yàn)橐笳麛?shù),因此約等于33%。
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