limx趋向于无穷 (x+1/x+3）∧2x
=lim(x->∞)(1-2/(x+3))^2x
=e^[lim(x->∞)(-2×2x/(x+3))]
=e^(-4)
limx趋向于无穷 (x+1/x+3）∧2x
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