求极限值 lim(3^n+2^2n)/(3^(n+1)+2^(2n+1))=

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求极限值lim(3^n+2^2n)/(3^(n+1)+2^(2n+1))=求极限值lim(3^n+2^2n)/(3^(n+1)+2^(2n+1))=求极限值lim(3^n+2^2n)/(3^(n+1)

求极限值 lim(3^n+2^2n)/(3^(n+1)+2^(2n+1))=
求极限值 lim(3^n+2^2n)/(3^(n+1)+2^(2n+1))=

求极限值 lim(3^n+2^2n)/(3^(n+1)+2^(2n+1))=
lim(3^n+2^2n)/(3^(n+1)+2^(2n+1))
= lim(n-->∞)[(3^n+4^n)/(3*3^n+2*4^n)]
= lim(n-->∞)[(3/4)^n+1]/[3*(3/4)^n+2*] (分子分母同时除以4^n)
=(0+1)/(0+2)
=1/2