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利用了兩個重要極限中的一個lim x->無窮大(1+1/x)^x=e lim(x->無窮大)(1-2/x)^(-1) =lim(x->無窮大)(1+(-2/x))^((-x/2)(-2/x)(-1)) =lim(x->無窮大)(1+(-2/x))^(-x/2)(2/x) =lim(x->無窮大)e^(2/x) =1
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