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
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0
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这不就是等差数列么?
14, 10, 6, 2, -2, -6, -10, -14
8项总和等于0。
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八年级把数都写出来就可以了
11年级2u学 “等差数列”(所以这个稍微变一下就成了高考题了)
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