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等差数列的定义是:一个数列从第二项起,每一项与它的前一项的差是同一个常数d,这样的数列称为等差数列.即数列满足a_(n+1)-a_n=d,课本采用不完全归纳法归纳出通项公式,有的资料上采用了累加的方法进行了证明:a_n=(a_n-a_(n+1))+
The definition of arithmetic progression is as follows: A series of numbers from the second, each with its previous one difference is the same constant d, such a sequence called the arithmetic sequence. That is, the sequence satisfies a_ (n +1) -a_n = d, the textbook adopts the incomplete induction method to generalize the formula of the general formula, and some of the data have been accumulated by the method of proof: a_n = (a_n-a_ (n + 1)) +