lim (n→∞) [(-2)^(n+1)/(1-2+4+...+(-2)^n)
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lim((5^n-4^(n-1))/((5^(n+1)+3^(n+2)) n→∞时的极限是多少?
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计算下列极限 lim(n→∞) (1/n)*[n*(n+1)..(2n-1)]^1/n