题一：借助于公式：lim n→∞ [(4^(1/n)-1)/(1/n)]=ln4lim n→∞ （2n-3)*(4^(1/n)-1)=4ln2题二：考虑级数∑n*(2/3)^n,用比值法判断级数收敛,通项以0为极限：lim n→∞n*(2/3)^n=0,lim n→∞ (2/3)^n *(1.5n-1.5)=0...