數(shù)列求和的七種方法ppt 遞增數(shù)列求和公式?
遞增數(shù)列求和公式?983通用項(xiàng)公式:an=A1(n-1)d an=am(n-m)d算術(shù)序列前n項(xiàng)之和:SN=[n(A1 an)]/2 SN=Na1[n(n-1)d]/2算術(shù)序列之和:算術(shù)序列之和=(尾
遞增數(shù)列求和公式?
983通用項(xiàng)公式:an=A1(n-1)d an=am(n-m)d算術(shù)序列前n項(xiàng)之和:SN=[n(A1 an)]/2 SN=Na1[n(n-1)d]/2算術(shù)序列之和:算術(shù)序列之和=(尾數(shù))*項(xiàng)數(shù)/2算術(shù)序列項(xiàng)數(shù)=[(尾數(shù)第一)數(shù)量/公差]1