已知一列數(shù):4,6,8,10,.78是這個(gè)數(shù)列的第幾項(xiàng)?
已知一列數(shù):4,6,8,10,.78是這個(gè)數(shù)列的第幾項(xiàng)?
急用!
急用!
數(shù)學(xué)人氣:967 ℃時(shí)間:2020-04-10 22:04:13
優(yōu)質(zhì)解答
項(xiàng)數(shù)=(末項(xiàng)-首相)/公差+1=(78-4)/2+1=38,第38項(xiàng)
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