Arithmetic Sequences and Geometric Sequences

被引：0

作者：

井鑫 ^{[1
]}

机构：

[1] 陕西省米脂县第一中学

来源：

中学数学教学参考 | 2006年 / 23期

关键词：

Arithmetic Sequences and Geometric Sequences;

D O I：

暂无

中图分类号：

G634.6 [];

学科分类号：

04 ; 0401 ;

摘要：

An arithmetic sequence is a sequence of numberseach of which,after the first,is obtained by addingto the preceding number a constant number calledthe common difference.Thus 3,7,11,15,19,…is an arithmeticsequence because each term is obtained by adding 4to the preceding number.In the arithmetic sequence50,45,40,…the common difference is 45-50=40-45=-5.General formulas for arithmetic sequencesinclude:the nth term an=a1+(n-1)d,and the sum of the first n terms

引用

页码：52 / 52

页数：1