Resposta:

B)5x5x5x5x5x5x5x5 : 5x5x5x5x5x5 = 390625 : 15625 = 25

C)(2*4)*2 = 2*8 = 256

D)8*17 = 2.2517998e+15...

E)40² = 1600

F)(81:16) = 5.0625

G)1

Bons Estudos!