为了方便广大考生更好的复习,综合整理了GMAT数学中的数据充分性,以供各位考生考试复习参考,希望对考生复习有所帮助。
1. GMAT数据充分性问题的说明相当复杂。做真题的时候,在着手解题之前,花些时间冷静的学习一下数据充分性问题的说明,是很有必要的。熟读、理解整个说明,熟记下面这五个选项,这五个选项对于每一道数据充分性问题都是一样的。考试时,千万不要再花时间看说明了。
A. Statement ALONE is sufficient, but statement alone is not sufficient to answer the question asked;
B. Statement ALONE is sufficient, but statement alone is not sufficient to answer the question asked;
C. BOTH statements and TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient;
D. EACH statement ALONE is sufficient to answer the question asked;
E. Statements and TOGETHER are NOT sufficient to answer the question asked, and additional dataspecific to the problem are needed.
2. 搞清楚,你的目标是判定是否有足够的信息来回答问题。不要花时间进行任何运算。GMAT数据充分性问题主要是考查数学概念,而不是数字运算的能力。如果你发现自己在进行大量的笔头运算,那你一定走错了方向。
3. 和标准多项选择题中的几何图形不同的是,数据充分性问题的图形并不一定成比例除非说明了图形是按比例作出的。不要目测角度大小、线段长度和面积。要利用数学知识处理题干给出的数字,来解决问题。
4. 要避免常见陷阱。例如方根的正负性问题,树值的唯一性问题,以及must be与should be, could be这样的文字游戏。
5. 如果可以排除选项A或选项B中的一项,就可以排除选项D。
例如:Is CAB a code word in language Q?
ABC is the base word.
If C immediately follows B, then C can be moved to the front of the code word to generate another word.
这道例题中,一看第一项就没有说明生成新词的规则,因此A可以排除,D可以排除。剩下的工作就只有结合两条说明项,检查选项C的正误了。
6. 如果两条说明项中的一项就足够回答题干中的问题,就可以排除选项C和E了。
例如:What is the value of x?
3x = 24
4x 36
很明显,第一条说明项就可以回答答题干中的问题,C和E就都被排除了。剩下的就看说明项能不能确定x的数值了。
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