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limx趋于正无穷(x+1/x-1)x次方急求,需详细步骤!急!

题目详情
limx趋于正无穷(x+1/x-1)x次方
急求,需详细步骤!急!
▼优质解答
答案和解析
lim(x→∞)(x+1/x-1)^x
=lim(x→∞)[1+2/(x-1)]^x
=lim(x→∞)[1+2/(x-1)]^(x-1)*lim(x→∞)[1+2/(x-1)]
=lim(x→∞)[1+2/(x-1)]^(x-1)
=lim(x→∞){[1+2/(x-1)]^[(x-1)/2]}^2
=e^2