对数运算应该先乘除还是先加减

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select * from tbl_Articles WHERE ArticleID=1646048 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1646048 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1646048 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1299062,276502,294140,1629903,1806106,1104865,1087599,2103824,2260675,1283733,1043345,1386399,3052852,1298008,2478243,222508,3122695,2655080,1394957,806725,1390495,165876,1114552,1324796,1065511,1343174,1114540,318708,1365862,1048280) ORDER BY field (ArticleID,1299062,276502,294140,1629903,1806106,1104865,1087599,2103824,2260675,1283733,1043345,1386399,3052852,1298008,2478243,222508,3122695,2655080,1394957,806725,1390495,165876,1114552,1324796,1065511,1343174,1114540,318708,1365862,1048280)