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。
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.
本学期初会有各种作业，学期末则需实作程序专题。本课程值6工程设计学分。
The semester starts with various assignments, and ends with a substantial programming project. This course is worth 6 Engineering Design Points.
易逝品具有销售周期短、期末未售出产品残值低、需求不确定性大等明显特征。
Perishable products have obvious characters of short sales cycle, low residual value of unsold products in the end of period and uncertainty demand.
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