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[tex] {k}^{4} - 8 {k}^{2} + 16 = 0 \\ ( {k}^{2} - 4)^{2} = 0 \\ {k}^{2} - 4 = 0 \\ {k}^{2} = 4 \\ k = 2 \\ k = - 2[/tex]
Произведение: 2*(-2)=-4
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Ответ : - 4
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