讨论调和级数的变化规律。画出部分和数列 变化的折线图，观察变化规律；引入数列： 作图观察其变化，猜测是否有极限；引入数列：，作图观察其变化，寻找恰当的函数拟合；探讨调和级数的部分和数列的变化规律是什么？-Discussion to reconcile a series of changes in the law. Draw the line chart of some of the several columns change, observed changes in law the intr