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Console.WriteLine(Math.Round(6.66666666666, 1, MidpointRounding.AwayFromZero).ToString());
Console.WriteLine(6.66666666666.ToString("f1"));
Console.WriteLine(Math.Round(6.55555555555, 1, MidpointRounding.AwayFromZero).ToString());
Console.WriteLine(6.55555555555.ToString("f1"));
Console.WriteLine(Math.Round(6.44444444444, 1, MidpointRounding.AwayFromZero).ToString());
Console.WriteLine(6.44444444444.ToString("f1"));