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Автор - afanacia3

Решите уравнение:
-9=8х-х^2

Ответ

Автор - Элая
-х^2+8х +9=0
Д= 64 + 36 = 100
х1 = 8 +10/2= 9
х2 = 8-10/2 =-1
(х-9)(х+1)=0

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