n5次方比en次方取极限 - 知识问答

n5次方比en次方取极限

2个回答

原式=lim(n->∞)n^5/e^n
=lim(x->+∞)x^5/e^x
=lim(x->+∞)5x^4/e^x
=lim(x->+∞)20x^3/e^x
=lim(x->+∞)60^2/e^x
=lim(x->+∞)120x/e^x
=lim(x->+∞)120/e^x
=0

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