整体代入法是初中数学中常见的方法.如已知x+1/x=a,求x/3+1/x~3的值(a为常数),通过分解因式,然后整体代入,就可以轻松得到结果.整体代入法要根据已知,通过观察构造累加等方法,灵活进行转化,从而达到简化运算的目的.它也是高中数学常用的一种方法请看下面几个例子.例1数列{an}中 The whole substitution method is a common method in junior high school mathematics. If x + 1 / x = a is known, find the value of x / 3 + 1 / x ~ 3, where a is a constant. Can easily get the result. The overall substitution method to be based on the known, by observing the structure of accumulation and other methods, the flexibility to transform, so as to achieve the purpose of simplifying the operation. It is also a high school mathematics commonly used method, see the following examples. an}