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设数列{an}的前n项和为Sn且﹣2Sn﹣anSn+1=0,n=1,2,3…
(1)求a1,a2
(2)求Sn与Sn﹣1(n≥2)的关系式,并证明数列{}是等差数列.
(3)求S1•S2•S3…S2010•S2011的值.