а) = b*(49-b^6) = b*(7-b^3)*(7+b^3)
б) = 9*(a^2-8ab+16b^2) = 9*(a-4b^2)
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а) = b*(49-b^6) = b*(7-b^3)*(7+b^3)
б) = 9*(a^2-8ab+16b^2) = 9*(a-4b^2)