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GRE數學考試的經典例題講解

　　考生在備考GRE數學考試的過程中，可以多了解一些比較經典的例題。下面就讓小編給大家講解GRE數學考試的比較經典的部分例題吧，希望能對你有幫助!

GRE數學

　　GRE數學的經典例題：dollar amount

　　If the dollar amount of sales at Store P was $800,000 for 2006, what was the dollar amount of sales at that store for 2008 ?

　　A $727,200

　　B $792,000

　　C $800,000

　　D $880,000

　　E $968,000

　　直接算，800000*(1+10%)*(1-10%)=792000，即B

　　2)At Store T, the dollar amount of sales for 2007 was what percent of the dollar amount of sales for 2008 ?

　　Give your answer to the nearest 0.1 percent.___________%

　　直接算，1/(1-8%)=108.7%(約等于)

　　3)Which of the following statements must be true?

　　Indicate all such statements.

　　A For 2008 the dollar amount of sales at Store R was greater than that at each of the other four stores.

　　B The dollar amount of sales at Store S for 2008 was 22 percent less than that for 2006.

　　C The dollar amount of sales at Store R for 2008 was more than 17 percent greater than that for 2006.

　　本題A選項一看到就可以排除了，涉及到兩個店的絕對量的比較，這個不確定，沒有告訴絕對值。B選項是把兩個增長的比例簡單地算術相加。肯定錯了。所以C肯定是對的了。。算一下也是的確是對的。

　　GRE數學例題解析：more than twice

　　Each employee of a certain company is in either Department X or Department Y, and there are more than twice as many employees in Department X as in Department Y. The average (arithmetic mean) salary is $25,000 for the employees in Department X and is $35,000 for the employees in Department Y. Which of the following amounts could be the average salary for all of the employees in the company?

　　Indicate all such amounts.

　　A $26,000

　　B $28,000

　　C $29,000

　　D $30,000

　　E $31,000

　　F $32,000

　　G $34,000

　　本題我們要注意到題目中的more than twice的.字眼，我們當做twice算的時候，結果是(25000*2+35000)/3約等于28333，因為有more than，所以選的答案要么是比前面這個數大，要么小，又由于more的是X部門的，那么肯定會將平均工資給拉低了，因此，選比前面那個數小的答案，AB都可以了。

　　GRE數學例題講解：how many minutes

　　Working alone at its constant rate, machine A produces k car parts in 10 minutes. Working alone at its constant rate, machine B produces k car parts in 15 minutes. How many minutes does it take machines A and B, working simultaneously at their respective constant rates, to produce k car parts? ____________minutes

　　這類GRE OG題目小學時候經常遇到，相信很多人都是這種感受哈

　　1/(1/10+1/15)=6min

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