function Tinh_TongCacPhanTuTrongMaTran_A()

clc;

m = input('nhap vao so dong cua mang: ');

n = input('nhap vao so cot cua mang: ');

Tong = 0;

for i=1:m

    for j=1:n

        fprintf ('nhap vao tung phan tu cua mang: ');

        A(i,j) = input(' ');

    end

end

for i=1:m

    for j=1:n

        Tong = Tong + A(i,j);

    end

end

fprintf ('Tong cac phan tu trong ma tran A la: %d

', Tong);