数列一题不会.一个项数为偶数的等差数列,其奇数项之和为24,偶数项之和为30,最后一项比第一项大21/2,则最后一项=?我好郁闷啊,碰到之类,老是弄不清楚项 之间的关系,比如一共多少项啊?奇数
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![数列一题不会.一个项数为偶数的等差数列,其奇数项之和为24,偶数项之和为30,最后一项比第一项大21/2,则最后一项=?我好郁闷啊,碰到之类,老是弄不清楚项 之间的关系,比如一共多少项啊?奇数](/uploads/image/z/3926422-46-2.jpg?t=%E6%95%B0%E5%88%97%E4%B8%80%E9%A2%98%E4%B8%8D%E4%BC%9A.%E4%B8%80%E4%B8%AA%E9%A1%B9%E6%95%B0%E4%B8%BA%E5%81%B6%E6%95%B0%E7%9A%84%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%85%B6%E5%A5%87%E6%95%B0%E9%A1%B9%E4%B9%8B%E5%92%8C%E4%B8%BA24%2C%E5%81%B6%E6%95%B0%E9%A1%B9%E4%B9%8B%E5%92%8C%E4%B8%BA30%2C%E6%9C%80%E5%90%8E%E4%B8%80%E9%A1%B9%E6%AF%94%E7%AC%AC%E4%B8%80%E9%A1%B9%E5%A4%A721%2F2%2C%E5%88%99%E6%9C%80%E5%90%8E%E4%B8%80%E9%A1%B9%3D%3F%E6%88%91%E5%A5%BD%E9%83%81%E9%97%B7%E5%95%8A%2C%E7%A2%B0%E5%88%B0%E4%B9%8B%E7%B1%BB%2C%E8%80%81%E6%98%AF%E5%BC%84%E4%B8%8D%E6%B8%85%E6%A5%9A%E9%A1%B9+%E4%B9%8B%E9%97%B4%E7%9A%84%E5%85%B3%E7%B3%BB%2C%E6%AF%94%E5%A6%82%E4%B8%80%E5%85%B1%E5%A4%9A%E5%B0%91%E9%A1%B9%E5%95%8A%3F%E5%A5%87%E6%95%B0)
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