lim2^(n+1)+3^(n+1)/2^n+3^n x趋近无穷~

问题描述:

lim2^(n+1)+3^(n+1)/2^n+3^n x趋近无穷~

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