等差数列是一种特殊的数列,它在高中数学中占据着重要地位.等差数列揭示了数列中任意连续两项的特殊性.项与项之间的特殊关系是它的突出特点,也是灵活应用的基础.笔者,从等差数列项与项的关系,阐述它的灵活应用.一、等差数列中任意两项的关系 The arithmetic difference series is a special series which occupies an important position in high school mathematics.The arithmetic series reveal the particularity of any two consecutive numbers in the series.The special relationship between terms and terms is its salient features as well Flexible application of the basis of the author, from the arithmetic progression of the relationship between the items, elaborating on its flexible application. First, the arithmetic progression of any two of the relationship