解析:
lim(n—>+∞) an
=lim(n—>+∞) [(2^n -3)/(3^n +2)]
=lim(n—>+∞) [(2/3)^n -(1/3)^(n-1) ]/[1+2/(3^n)]
=lim(n—>+∞) (0+0)/(1+0)
=0