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1 2 1 2 () () ()() 1+1/2^2 1+2+1+2+1+2+1+2+1+2+1+2+1+2 =( )*( ) =() (2-×)(1-×)=×-2-2(2-×)(1-×) (1-1/2^2)(1-1/3^2)(1-1/4^2).(1-1/2009^2), 1,2, 1/2 1、2、 1 2 1+2? 1、2 1,2, 1 2 1,2, 1 2 #1#2 1,2, 2,1