【摘要】 讨论了时间间隔变化的非年金形式.并研究了付款额呈高阶等差数列及倒虹式年金等某些特殊的年金变化形式,给出了其期初值和期末值.更多还原

【Abstract】 The changing nonannuity forms in time intervals are discussed. Some special patterns of annuity changes whose payments are of the arithmetic progression of higher order or of the reverse rainbow are studied, and their beginning values and ending values are given.更多还原