[R-br] trabalhando com números pequenos

[salah]

segue sugestão

library(Rmpfr)

mpfr(500^(-10), precBits = 255) - mpfr(1, precBits = 255)
# 1 'mpfr' number of precision  255   bits
# [1] 
-0.999999999999999999999999998975999999999999914663505297831951000646311908486498

## caracteristica numerica da maquina
.Machine