這題函數怎樣計?(急!!!!!!!!!!!!)

2006-10-15 10:50 pm
這題函數怎樣計??
nl

13
29
3 18

write down a function relating ( l ) and ( n ).

回答 (3)

2006-10-15 11:24 pm
✔ 最佳答案
這函數
l = 3n(n+1)/2
所以
n = 1
l = 3(1)(1+1)/2 = 3
n =2
l = 3(2)(2+1)/2 = 9
n = 3
l = 3(3)(3+1)/2 = 18
.....
2006-10-15 11:10 pm
n is any integer

l =3 ^ n
2006-10-15 10:52 pm
什麼函數?


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