8 年级数学题求助

zycw

a sequence of numbers is changing by the same amount each time. the third, fourth and fifth numbers are 6,2, and -2. what is the sum of the first eight items in the sequence?
thanks

yxjtyy

0

sibada

这不就是等差数列么？

14, 10, 6, 2, -2, -6, -10, -14

8项总和等于0。

really

八年级把数都写出来就能了

十一年级2u学 “等差数列”（所以这个略微变一下就成为了高考题了）