已知利息与利率和时间怎么求本金

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1843697,3367356,3144496,2863888,1091210,1741543,3525390,3240458,533313,680070,3494865,793954,827009,3504259,900286,516333,2191449,1804925,2948702,2032418,1567412,2748793,926579,2491683,3109255,2659082,2508800,3254536,668283,1421488) ORDER BY field (ArticleID,1843697,3367356,3144496,2863888,1091210,1741543,3525390,3240458,533313,680070,3494865,793954,827009,3504259,900286,516333,2191449,1804925,2948702,2032418,1567412,2748793,926579,2491683,3109255,2659082,2508800,3254536,668283,1421488)