中一數學sequence 唔該

2009-11-06 6:46 am

問題:
A sequence -1/2,1/5,-1/10,1/17... is given.
Find an algebraic expression to represent the n th term of the sequence.
列式and解釋 plz

回答 (1)

2009-11-06 7:06 am

✔ 最佳答案

-1/2 = (-1)^1 / (1^2 + 1)
1/5 = (-1)^2 / (2^2 + 1)
-1/10 = (-1)^3 / (3^2 + 1)
1/17 = (-1)^4 / (4^2 + 1)
n-th term = (-1)^n / (n^2 + 1)

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