M 4 m 2 1 0 July 8, 2019 16 32 64 128 M 2 4m 1 0 M 4 2m 2 1 0 M 4 x 2 m 1 x 1 0 X2 2 m 1 x m 4 0 M 2 x 2 2 m 1 x 4 0 vô nghiệm Mx 4 2 m 1 x 2 m 1 0 3x 2 4 m 1 x m 2 4m 1 0 3x2 2 m 1 x m 4 0 Mx2 2 m 1 x m 4 0
