【摘要】 构造了两个数学模型,一个是摸球模型,另一个是搬砖模型。应用了这两个数学模型,对重复组合公式给出了一个新的证法。这种证法的特点是:直观、易懂、形象。比文献[1]给出的证法更简明。更多还原

【Abstract】 Two mathematic models are built.One is the model of touching balls.The other is the model of moving bricks.Using two mathematic models,a new demonstrating method is given out for the repeated combination formula.Its features are direct,understandable and imaginable.It is more simple than the one in the document[1].更多还原