Решите уравнения: 1)  х2- 6х + 3 = 0 ; 2) х2 - 6х + 9 = 0 ; 3) х4- 2х2- 81 = 0 ; 4) ( х2 - 6x)2 - 2 ( x - 3 ) = 81     Закрыть [Х]   Осталосьсек.
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