若a等于2求三角形周长最大值

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select * from tbl_Articles WHERE ArticleID=232859 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(809130,3272771,1306964,1115699,1130894,180756,580253,2861992,1674124,1469579,1368668,934397,515865,118273,113488,553724,1126644,1482914,2547321,849765,352175,1905429,1510038,1317025,1374828,214865,506786,123321,398014,451785) ORDER BY field (ArticleID,809130,3272771,1306964,1115699,1130894,180756,580253,2861992,1674124,1469579,1368668,934397,515865,118273,113488,553724,1126644,1482914,2547321,849765,352175,1905429,1510038,1317025,1374828,214865,506786,123321,398014,451785)