令 t = 1/x,x->0,t->∞lim(x->0) x² / e^(1/x) = lim(t->∞ ) e^(-t) / t² lim(x->0+) x² / e^(1/x) = lim(t->+∞ ) e^(-t) / t² = 0lim(x->0-) x² / e^(1/x) = lim(t->-∞ ) e^(-t) / t&#...