1/n
lim n(2 - 1)
n->∞
1/n
(2 - 1)
= lim

2^(1/n)对n微分=2^(1/n)*ln2*[?]

严格来说n不连续,不能直接微分 要先换成 2^(1/x)lim n->∞ ... = lim x->∞ ...