论文部分内容阅读
对于首项为a1,公比为q(q≠1)的等比数列 {an)的前n项和Sn的求和公式的证明,课本上 采用了错位相减法,下面给出另外三种证法．
For proof of the summation formula of the first n terms and Sn of the first item a1 and the geometric sequence {an) with q (q ≠ 1), the dislocation subtraction method is adopted in the textbook, and the other three kinds of evidences are given below law.