Ответы на вопрос:
5x^2 - 4x = 0 4x * ( 1.25x - 1 ) = 0 4x = 0 > x = 0 1.25x - 1 = 0 > 1.25x = 1 > x = 0.8 5x^2 - 4x + c = 0 x = 0 > c = 0 x = 0.8 > 3.2 - 3.2 + c = 0 > c = 0 ответ при с = 0
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