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数列是特殊的函数,数列的通项公式以及前n项和的公式,实际上是定义在自然数集或其子集上的函数.等差数列(d≠0时)的通项公式an=a1+(n-1)d是n的一次函数,其图像是过点(1,a1)、斜率为d的直线
The series is a special function, the general formula of the series and the formula of the first n sums are actually functions defined on the natural number set or its subset. The general formulae of the equal-difference series (d≠0) is an=a1+ (n-1)d is a linear function of n whose image is a straight line (1, a1) with a slope of d