Respostas

2014-07-14T17:31:07-03:00
 123456³ - 123456 * 123455² 
 123456² + 123456 * 123455

123455² ⇒ 123455 * 123455 = 15.241.137.025
123456² ⇒ 123456 * 123456 = 15.241.383.936 
123456³ ⇒ 123456 * 123456 * 123456 = 1.881.640.295.202.816

Resolução:
 1.881.640.295.202.816 - 123456 * 15.241.137.025  =  30.482.644.416  = 1 (alt. B)
          15.241.383.936 + 123456 * 123455                   30.482.644.416

Espero ter ajudado. Valeu!