2m 3 4m 7 July 8, 2019 16 32 64 128 3 2m 1 )+ 4m 7 3 2m 1 ≤ 4m 7 9 2m 3 )- 8 4m 7 2m 7 5m 9m 3 4m 7 6 6 2m 5mn )- 3 4m 7mn 2m 2 4m 3 )( 5m 7 4m 7 3 2m )= 15 2 3 m 2м - 3