末項(xiàng)公式即高斯求和公式：末項(xiàng)=首項(xiàng)+(項(xiàng)數(shù)-1)*公差；項(xiàng)數(shù)=(末項(xiàng)-首項(xiàng))/公差+1；首項(xiàng)=末項(xiàng)-(項(xiàng)數(shù)-1)*公差；和=(首項(xiàng)+末項(xiàng))*項(xiàng)數(shù)/2。等差數(shù)列是...

發(fā)布時(shí)間：2024-11-29 所屬欄目：百科知識 瀏覽量：609