lim 1/n(1+1/2)(1+1/3)……(1+1/n)lim(2/n^2+5/n^2+……+(3n-1)/n^2)
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lim(1/n+2/n+3/n+4/n+5/n+……+n/n)=lim(1/n)+lim(2/n)+……+lim(n/n)成立吗?(n趋近于无穷大)为什么不成立?
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