write out the summation?
回答 (2)
2020-05-12 12:19 am
✔ 最佳答案
Using i = 2 to i = 5 we get:(-1/2)¹ + (-1/2)² + (-1/2)³ + (-1/2)⁴
i.e. -1/2 + 1/4 - 1/8 + 1/16
Hence, (-8 + 4 - 2 + 1)/16 = -5/16
:)>
收錄日期: 2021-04-18 18:30:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200511160944AAjb9xW