设x，y∈R，a＞1，b＞1，若ax=by=3，a+b=2，则的最大值为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15532' and id < 2638730 and id<>'2638730' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15532' and id > 2638730 and id<>'2638730' order by id asc limit 5