2 3m 3 5m 4 July 8, 2019 16 32 64 128 (- 3m 4 m 3 )-( 5m 2 m 4 4 (- 3m 2 )- 5m 3 4m 5m 2 3m 3 5m 2 4m 6 3m 3 4m 2 5m 4 m 1 2 3m 4 5 3 5m (- 3m )+( 2 4n )-( 5m 3 8n 5m 3 4 3m 2 5 m 6 7 3 5•2m 2 m 3 m 2 3 m