GRE数学高难度技巧题实例讲解及拓展练习

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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。下面小编就通过几道高难度真题，为大家实例讲解其中的解题技巧。

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

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。

TIPS：GRE数学备考心得：基础扎实才能拿高分

在专注于解决最高难度的GRE题目前，先确保你已经完全掌握了以下基础知识点：解方程式、常用公式、百分比变换、分数相加相乘。还有更进一步的比如：简化带分数的方程式、小数与百分比转换、分数与小数转换、计算圆的面积和周长、多项式的计算和其他基础的初高中数学知识。

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