f（x）=x 3-bx 2+1在x∈（1，2）单调递增，在x∈（2，3）单调递减，则b=

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24611' and id < 2113170 and id<>'2113170' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24611' and id > 2113170 and id<>'2113170' order by id asc limit 5