GRE数学偶遇难题如何解决？2个难点题型实用解题技巧实例分析

摘要：GRE数学考试虽然平均难度不高，但其中也偶尔会有一些高难度题目出现，解答它们需要用到一些技巧。本文将通过几道高难度真题，为大家实例讲解其中的解题技巧，帮助大家应对可能出现在考试中的难题。

    GRE数学中常会出现一些比较超纲的难题题型，这些题目有的会耗费大家大量时间，有的则很容易引导考生给出错误答案。而应对这些难题，大家就需要在现有的解题能力上进一步提升解题思路技巧方面的积累。下面就开始实例分析。

    例题1：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

    本题我们要注意到题目中的more than twice的字眼，我们当做twice算的时候，结果是(25000*2+35000)/3约等于28333，因为有more than，所以选的答案要么是比前面这个数大，要么小，又由于more的是X部门的，那么肯定会将平均工资给拉低了，因此，选比前面那个数小的答案，AB都可以了。

    例题2：dollar amount

    1）、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%(约等于)

    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.

    本题A选项一看到就可以排除了，涉及到两个店的绝对量的比较，这个不确定，没有告诉绝对值。B选项是把两个增长的比例简单地算术相加。肯定错了。所以C肯定是对的了。通过计算也的确是对的。

    以上就是GRE数学高难度技巧题的一些解题心得技巧实例讲解，希望大家能够有所了解，在考试中遇到类似的题型才会轻松拿下。