Объяснение:
a*( 81*a^4 - 1) = a*(9^2 * a^4 - 1) = a*(9*a^2 - 1)*(9*a^2 + 1)
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Объяснение:
a*( 81*a^4 - 1) = a*(9^2 * a^4 - 1) = a*(9*a^2 - 1)*(9*a^2 + 1)