0/0型,∞/∞型的极限可以运用罗毕达方法:lim(1+x-e^x)/x (0/0 型) x→0 =lim(1-e^x)/2x (还是0/0 型) x→0 =lim(-e^x)/2 (已经是定型) x→0 =-1/2
lim趋向0时,e^x-e^-1/X
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