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.
按应付款项类别（其他应付款、预收账款等）分别列示应付款项的期末数、期初数以及占总额的比例；
It is required to separately list the beginning balance, ending balance and proportion to total amount of payables according to their categories (like other payables and advance payments, etc. );
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