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Решите треугольник. 1)Дано:угол А=57 градусов,угол в=31 градусов,с=10.Найти:а,в,угол С. 2)Дано:угол А=57 град.,угол С=31 град,в=10.Найти:а,с,угол В. 3)Дано:угол В=120 град.,а=210,в=300.Найти:с,угол А, угол С. 4)Дано: угол С=40 град., а=16,в=8.Найти:с,угол А, угол В.