17/11/15 13:37:04.58 bRQyF7b9.net
>>20 >>23
Σ[k=1,80］1/k = 4.9655
Σ[k=1,n］≒ 2.45 +（n-6)/6.5
n ≒ 6.213
17/11/15 13:37:04.58 bRQyF7b9.net
>>20 >>23
Σ[k=1,80］1/k = 4.9655
Σ[k=1,n］≒ 2.45 +（n-6)/6.5
n ≒ 6.213
17/11/15 13:37:04.58 bRQyF7b9.net
>>20 >>23
Σ[k=1,80］1/k = 4.9655
Σ[k=1,n］≒ 2.45 +（n-6)/6.5
n ≒ 6.213