下列命题正确的有（  ）个（1）若a＞b，则ac2＞bc2（2）若ac2＞bc2，则a＞b（3）若a＞b，c＞d，则a-c＞b-d（4）若a＜b＜1，则 1-a＞ 1-b．

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20395' and id < 1798157 and id<>'1798157' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20395' and id > 1798157 and id<>'1798157' order by id asc limit 5