✔ 最佳答案
lim x²³/2ˣ
x->∞
Plugging in x=∞ gives ∞/∞, so use l'hopital's rule
lim 23x²²/[(ln2)2ˣ]
x->∞
Still ∞/∞, so use l'hopital's rule again
lim (23*22)x²¹/[(ln2)(ln2)2ˣ]
x->∞
lim (23*22)x²¹/[(ln2)² 2ˣ]
x->∞
Still ∞/∞, so use l'hopital's rule again.... and again until we get
lim 23! / [(ln2)²³ 2ˣ]
x->∞
Now plugging in x=∞ will give...
= 23! / [(ln2)²³ 2^∞]
= 23!/∞
= 0