lim2^(n+1)+3^(n+1)/2^n+3^n x趨近無窮~

lim2^(n+1)+3^(n+1)/2^n+3^n x趨近無窮~

lim[2^(n+1)+3^(n+1)]/[2^n+3^n](n->無窮)
=lim(2/[ 1+(3/2)^n] + 3/[(2/3)^n +1])(n->無窮)
=0+3
=3