limx趋近于无穷大(2x+1)^3(x-3)^2/(x^5+4)

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limx趋近于无穷大(2x+1)^3(x-3)^2/(x^5+4)limx趋近于无穷大(2x+1)^3(x-3)^2/(x^5+4)limx趋近于无穷大(2x+1)^3(x-3)^2/(x^5+4)=

limx趋近于无穷大(2x+1)^3(x-3)^2/(x^5+4)
limx趋近于无穷大(2x+1)^3(x-3)^2/(x^5+4)

limx趋近于无穷大(2x+1)^3(x-3)^2/(x^5+4)
=lim2^3*(x+1/2)^3*(x-3)^2/(x^5+4)=2^3=8

上下同除以x^5得,(2+1/x)^3*(1-3/x)^2/(1+4/x^5)=8
ps:1/x,3/x,4/x^5都等于0