Cho pt x 2 m 1 x m 4 0 July 8, 2019 16 32 64 128 Cho pt x 2 2 m 1 x 2m 4 0 Cho pt x 2 4m 1 x 2 m 4 0 Cho pt x 2 2 m 1 x 6m 4 0 Cho pt x 2 4 m 1 x 12 0 Cho pt mx 2 2 m 1 x m 4 0 Cho pt x2 2 m 1 x m 4 0 Cho pt m 1 x 2 2mx m 4 0 Chopin op 17 n4 Chopin op 20 no 4