an=3n^2-25n+7,對(duì)稱軸 n=25/6≈4
所以,當(dāng)n=4時(shí),an最小.
最小項(xiàng)是第4項(xiàng).
已知數(shù)列an通項(xiàng)公式an=3n^2-25n+7,則數(shù)列an的最小項(xiàng)是第幾項(xiàng)
已知數(shù)列an通項(xiàng)公式an=3n^2-25n+7,則數(shù)列an的最小項(xiàng)是第幾項(xiàng)
數(shù)學(xué)人氣：977 ℃時(shí)間：2020-05-23 14:55:47
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