Одна сторона треугольника равна 2m – 4n, вторая сторона на n + 3nm больше первой, а третья сторона равна 5m – 5mn. Найди периметр (P) треугольника.
9m + 7n – 2mn
7m – 3n – 2mn
7m – 9n – mn
9m – 7n – 2mn
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