A^2 -b^2 = (a+b) . (a-b) a^2 + 2ab + b2 = (a+b)^2
a^3 + b^3 = (a+b) . (a^2 - ab +b^2)

seja N o resultado da operaçao 425^2 - 424^2 a soma de algarismo de N e
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