Question

Si abc x 999...456, calcula a+b+c


(Ayuda porfavor :'v)

Answer 1

truco:

ab x 99 = ab00 - ab

abc x 999 = abc000 - abc

abc x 999 = ...456

abc000 - abc = ...456

a=5, b=4, c=4

∴ a+b+c = 5+4+4 = 13

Answer 2

Respuesta:

ab x 99 = ab00 - ab

abc x 999 = abc000 - abc

abc x 999 = ...456

abc000 - abc = ...456

a=5, b=4, c=4

∴ a+b+c = 5+4+4 = 13