lim[(x-1)/(x+1)]^x
=lim[1-2/(x+1)]^x
=lim[1-2/(x+1)]^[-(x+1)/2*(-2)]/[1-2/(x+1)]
limx趋近于无穷大[1-2/(x+1)]=1
原式
={lim[1-2/(x+1)]^[-(x+1)/2]}^(-2)
=e^(-2)
=1/e²
lim[(x-1)/(x+1)]^x
=lim[1-2/(x+1)]^x
=lim[1-2/(x+1)]^[-(x+1)/2*(-2)]/[1-2/(x+1)]
limx趋近于无穷大[1-2/(x+1)]=1
原式
={lim[1-2/(x+1)]^[-(x+1)/2]}^(-2)
=e^(-2)
=1/e²