求极限lim(x~0)((e^x+e^2x+e^3x)/3)^1/xs_数学解答

求极限lim(x~0)((e^x+e^2x+e^3x)/3)^1/x
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人气：472 ℃　时间：2019-10-19 19:08:04

解答

lim(x~0)((e^x+e^2x+e^3x)/3)^1/x
=lim(x~0)(e^(ln(e^x+e^2x+e^3x)/3)/x)
=e^(lim(x~0)(ln(e^x+e^2x+e^3x)/3)/x)
=e^(lim(x~0)(3(e^x+2e^2x+3e^3x)/(e^x+e^2x+e^3x))
=e^(3(1+2+3)/(1+1+1))
=e^6