配对法解题举隅姜海平（湖南省武冈市一中４２２４００）配对法是解数学题的一种重要技巧，对许多较难题，恰当运用此法，常可简捷求解．下面举例加以说明．一、等距配对对于数列求和问题，若项数奇、偶性确定，且与首末等距的两项之和为定值，则可用等距配对巧妙求解．例... The pairing method to solve the problem is given by Jiang Haiping (422400, Yizhong, Wugang City, Hunan Province). The pairing method is an important technique for solving mathematics problems. For many difficult problems, this method is used properly and can often be solved easily. The following example illustrates it. First, equidistant pairing For the sequence summation problem, if the number of odd and even items is determined, and the sum of the two items that are equidistant from the beginning and the end is constant, the equidistant pairing can be used to solve the problem. example...