lim(x→∞) (1+5/x)^2x的极限怎么求?
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/15 05:42:17
lim(x→∞) (1+5/x)^2x的极限怎么求?
lim(x→∞) (1+5/x)^2x
=lim(x→∞) (1+5/x)^(2*5x/5)
=lim(x→∞) [(1+5/x)^x/5]^10
=e^10
再问: 那这个怎么变lim(x→∞) ((2x+3)/(2x+1))^(x+1)
再答: lim(x→∞) ((2x+3)/(2x+1))^(x+1) =lim(x→∞) ((2x+1+2)/(2x+1))^(x+1) =lim(x→∞) (1+2/(2x+1))^(x+1) =lim(x→∞) (1+1/(x+1/2))^(x+1) =lim(x→∞) (1+1/(x+1/2))^(x+1/2+1/2) =√[lim(x→∞) (1+1/(x+1/2))^(x+1/2)] =√e
=lim(x→∞) (1+5/x)^(2*5x/5)
=lim(x→∞) [(1+5/x)^x/5]^10
=e^10
再问: 那这个怎么变lim(x→∞) ((2x+3)/(2x+1))^(x+1)
再答: lim(x→∞) ((2x+3)/(2x+1))^(x+1) =lim(x→∞) ((2x+1+2)/(2x+1))^(x+1) =lim(x→∞) (1+2/(2x+1))^(x+1) =lim(x→∞) (1+1/(x+1/2))^(x+1) =lim(x→∞) (1+1/(x+1/2))^(x+1/2+1/2) =√[lim(x→∞) (1+1/(x+1/2))^(x+1/2)] =√e
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