计算lim3^n-2^n+1/3^n+1+2^n=?
问题描述:
计算lim3^n-2^n+1/3^n+1+2^n=?
答
分子分母同除以4^(n+1)得:lim((2^(n+1)-8)/(4^(n+1)+3^n) =lim((1/2)^(n+1)-8/4^(n+1))/(1+(3^n)/4^(n+1))=0
计算lim3^n-2^n+1/3^n+1+2^n=?
分子分母同除以4^(n+1)得:lim((2^(n+1)-8)/(4^(n+1)+3^n) =lim((1/2)^(n+1)-8/4^(n+1))/(1+(3^n)/4^(n+1))=0