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Автор - undergroud

Решите уравнение пожалуйста
а) (x — 2) (х + 4) = 0;
б) (х + 3,5) (х – 7) (x2 + 9) = 0;
в) (x + 2,8) (х + 1,3) = 0;
г) x- x-3) (x° + 1) = 0.

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