谁能解释下等额本息计算公式

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select * from tbl_Articles WHERE ArticleID=1744189 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1744189 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1744189 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1789128,1080717,1091167,852042,1372119,1090909,806759,1695402,1060331,1490453,1123745,194182,1110872,1044133,1123343,294858,1132143,768957,1107899,1717792,1099103,1068494,987806,213603,204189,1765799,1115449,1076237,1105063,2441316) ORDER BY field (ArticleID,1789128,1080717,1091167,852042,1372119,1090909,806759,1695402,1060331,1490453,1123745,194182,1110872,1044133,1123343,294858,1132143,768957,1107899,1717792,1099103,1068494,987806,213603,204189,1765799,1115449,1076237,1105063,2441316)