若直线过圆x2+y2-2x+2y=0的圆心，则3a+b的最小值为

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id < 2638725 and id<>'2638725' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='15531' and id > 2638725 and id<>'2638725' order by id asc limit 5