lim(1+3+.+3^n)/(3^n+2^n)是多少 n趋向正无穷的极限
5个回答
分子用等比数列求和公式 =(1-3^(n+1))/2=(3^(n+1)-1)/2
然后分子分母同时除以3^n,再取极限,注意a^n(当a
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