已知数列{An}满足:A1=3 ,An+1=(3An-2)/An,n属于N*.1）证明：数列{（An--1）/（An--2）}为等比数列,并求数列{An}的通项公式；2）设Bn=(1/（An--2）)-n,求数列{Bn}的前n项和

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