求极限lim[(x-4)/(x+3)]^x x趋向无穷大？
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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^-7,2,得1,2,原式=[1-7/（x+3）]^x
=[1-7/(x+3)]^[(x+3)/7*7x/(x+3)]
=e^[7x/(x+3)]
=e^7
我先回答的～～
如有疑问请在线交谈～～,2,
=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^-7,2,得1,2,原式=[1-7/（x+3）]^x
=[1-7/(x+3)]^[(x+3)/7*7x/(x+3)]
=e^[7x/(x+3)]
=e^7
我先回答的～～
如有疑问请在线交谈～～,2,
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