求极限lim[(x-4)/(x+3)]^x x趋向无穷大

问题描述:

求极限lim[(x-4)/(x+3)]^x x趋向无穷大

lim[(x-4)/(x+3)]^x
=lim[1-7/(x+3)]^x
={lim[1-7/(x+3)]^[-(x+3)/7]}^-7*lim[1-7/(x+3)]^-3
=e^-7*1
=e^-7