an=3×2^(n-1)
第20项是:
a20=3×2^(19)
已知数列3,6,12,24……求数列通项公式及20项
已知数列3,6,12,24……求数列通项公式及20项
数学人气:437 ℃时间:2020-03-28 21:21:35
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