GRE数学疑难题型实用解题技巧实例分析 理清思路才能顺利应对难题
- 2018年04月11日15:46 来源:小站整理
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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。