新GRE数学考点总结及例题解析（九）
查字典出国留学网gre频道是一个专门提供gre考试辅导的专业网站，提供的内容涵盖考前报名、备考，考中技巧、注意事项，考后成绩查询等全过程，希望可以帮助各位gre考友拿下gre。
新GRE数学考试要求的是中学的数学知识，考生们对于新GRE数学上面来说还是比较有把握，不过说到具体的GRE数学考点要求就不一定这么清楚。下面就为大家介绍新GRE数学考点及这些GRE数学考点解析，帮助考生们系统的复习一遍新GRE数学，梳理整合新GRE数学考试所需要的知识。
GRE数学考点：Algebraic Fraction
An algebraic fraction is division of one polynomial by another. An algebraic fraction can be simplified by canceling the common factors between the numerator and denominator.
Example:
(x2-a2)/(x-a)=(x+a)*(x-a)/(x-a)=(x+a).
(x2-3x+2)/(x-1)=(x-2)(x-1)/(x-1)=(x-2).
Factor out both the numerator and denominator to find the common factors.
GRE数学考点介绍：At Least Once
At Least Once
If probability of an event happening is p, then the probability that the event happens at least once in n trials is 1-(1-p)∧n.
Example:
To understand the equation follow these steps:
1.The probability of the event not happening is 1-p.
2.The probability it won't happen n-times in a row is (1-p)∧n.
3.Probability it will happen at least once is 1-(1-p)∧n.
Probability that a roll of a six-sided die land with face 1 is 1/6.Then the probability that 1 will turn up at least once in 3 tries:=1-(1-1/6)∧3=1-(5/6)∧3.
Remember:
It is much harder to directly calculate the at-least-once probability.
以上就是新GRE数学考点及GRE数学考点解析的介绍，希望这些知识点的介绍可以帮助大家复习新GRE数学，为大家复习新GRE数学提供条件。希望考生们认真复习新GRE数学考试，能够取得自己理想的成绩。
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