问题
填空题
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答案
lim n→∞
=3+32+…+3n 3n-2n lim n→∞
=3(1-3n) 1-3 3n-2n lim n→∞
=3(3n-1 ) 2 3n-2n 3 2 lim n→∞
=3n-1 3n-2n 3 2
故答案为：3 2
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lim n→∞
=3+32+…+3n 3n-2n lim n→∞
=3(1-3n) 1-3 3n-2n lim n→∞
=3(3n-1 ) 2 3n-2n 3 2 lim n→∞
=3n-1 3n-2n 3 2
故答案为：3 2