Ответы на вопрос:
81x^5 - x^3 = 0 x^3(81x^2 - 1) = 0 x^3(9x - 1)(9x + 1) = 0 x^3 = 0 x = 0 9x - 1 = 0 9x = 1 x = 1/9 9x + 1 = 0 9x = - 1 x = - 1/9 ответ: x1 = 0, x2 = 1/9, x3 = - 1,9.
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