lim(1-2/x)^2x=?x趋向于无穷
lim(1-2/x)^2x(x趋向于无穷)=lim[1+1/(-x/2)]^[(-x/2)*(-4)](x趋向于无穷)=lim{[1+1/(-x/2)]^(-x/2)}^(-4)(x趋向于无穷)=e^(-4)
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