Ответ: теорема Виета
[tex]x1 + x2 = - p \\ x1 + x2 = - ( - 9) \\ x1 + x2 = 9[/tex]
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Ответ: теорема Виета
[tex]x1 + x2 = - p \\ x1 + x2 = - ( - 9) \\ x1 + x2 = 9[/tex]