2016年8月17日GRE數(shù)學(xué)考試機(jī)經(jīng)

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    8月17日的GRE考試馬上就要來(lái)了,同學(xué)們?cè)诳记凹訌?qiáng)一下復(fù)習(xí),多看一道題說(shuō)不定就多拿點(diǎn)分?jǐn)?shù)哦。出國(guó)留學(xué)網(wǎng)GRE欄目為大家?guī)?lái)2016年8月17日GRE數(shù)學(xué)考試機(jī)經(jīng),預(yù)祝大家取得理想成績(jī)!
    2016年8月17日GRE數(shù)學(xué)考試機(jī)經(jīng)
    1. x is 7 more than y
    A. Quantity A x
    B. Quantity B y
    C. Quantity A is greater.
    D. Quantity B is greater.
    E. The two quantities are equal.
    F. The relationship cannot be determined from the information given.
    答案:A
    X比Y大7,那么不論如何A都比B數(shù)字大。
    2. If 0 < st < 1, then which of the following ca be true?
    A. s< 0 and t> 0
    B. s< -1 and t< -1
    C. s > -1 and t< -1
    D. s > 1 and t<-1
    E. s > 1 and t> 1
    答案:C
    st比0大比1小,則很有可能皆為負(fù)或者皆為正,但是都不能同時(shí)大于1或者小于-1,則只有C符合要求。
    3. On segment WZ, if WY=21, XZ =26, and YZ is twice WX, what is the value of XY?
    

    A. 5
    B. 10
    C. 11
    D. 16
    E. It cannot be determined from the information given
    答案:D
    列出兩個(gè)等式即可得出答案:WX+XY=21; 2WX+XY=26,最后計(jì)算可以得出,WX=5, XY=16。
    4. If a certain sample of data has a mean of 20.0 and a standard deviation of 3.0, which of the following values are more than 2.5 standard deviations from the mean?
    A. 12.0
    B. 13.5
    C. 17.0
    D. 23.5
    E. 28.5
    答案:E
    給出了平均數(shù)20和標(biāo)準(zhǔn)差3,那么要比20+2.5*3大的數(shù),只有28.5符合要求,則答案為E。
    5. Which of the following could be the equation of the graph in the xy-plane shown below?
    

    A. y = x2 + x - 60
    B. y = x2 + x - 20
    C. y = x2 + 3x - 60
    D. y = 3x2 + x - 60
    E. y = 3x2 + 3x - 60
    答案:E
    根據(jù)函數(shù)圖像,可將X=0時(shí), y=-60; X=4時(shí), y=0; X=-5時(shí), y=0三組數(shù)值帶入選項(xiàng)中,都符合條件的只有E,則等式E為正確答案。
    GRE數(shù)學(xué)代入解題法介紹
    所謂代入解題法,就是指反過(guò)來(lái)根據(jù)選項(xiàng)來(lái)反推題目解題的方法。簡(jiǎn)單來(lái)說(shuō),把選項(xiàng)代入計(jì)算驗(yàn)證的方法,就使用到了代入解題的思路。對(duì)于許多復(fù)雜的,正面解決需要大量計(jì)算的題目來(lái)說(shuō),代入解題法不僅不會(huì)消耗大家的考試時(shí)間,反而會(huì)節(jié)省下不少時(shí)間,大幅度提高解題速度,使用得當(dāng)甚至能帶來(lái)較大幅度的提分。
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