static void Main(string[] args)
Console.WriteLine($"{s}");
public static int Bai_315(int[,] a)
for (int i = 0; i < a.GetLength(0); i++)
for (int j = 0; j < a.GetLength(1); j++)
public static int[,] Nhapmatran()
Console.WriteLine("nhap so dong:");
int n = int.Parse(Console.ReadLine());
Console.WriteLine("nhap so cot:");
int m = int.Parse(Console.ReadLine());
for (int i = 0; i < a.GetLength(0); i++)
for (int j = 0; j < a.GetLength(1); j++)
Console.WriteLine($"nhap A({i},{j}");
a[i, j] = int.Parse(Console.ReadLine());
public static int Tinhtong(int[,] a)
for (int i = 0; i < a.GetLength(0); i++)
for (int j = 0; j < a.GetLength(1); j++)
public static void XuatMaTran(int[,] a)
for (int i = 0; i < a.GetLength(0); i++)
for (int j = 0; j < a.GetLength(1); j++)
Console.Write($"{a[i, j]}");