裂项相消求和法是数列求和中重要且具有典型特征的方法之一.在求和时通过把数列的通项分成2项之差的形式,使中间的一些项正、负抵消,从而求得其和.1常规情形在常规情形下,用裂项相消法求和的关键是先将复杂的式子转化为2个式子差的形式.此方法适用于 The splitting term destructive summation method is one of the important and typical features of the sequence summation. In the summation, by dividing the general term of the series into the form of the difference between the two terms, the intermediate terms are canceled positively and negatively. In order to obtain the sum of .1 conventional cases, in the conventional case, the key to the summation using the split term destructive method is to first convert the complex formula into the form of two differences. This method is applicable to