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2014-10-29T09:09:26+02:00
(3^52-3^51-3^50)^2:(9^50x25)= 3^50(3^2-3-1):3^2x50x5^2= 3^50x5:3^100x5^2= 3^-50x5^-1= 1/3^50x1/5= 1/3^50x5