-18/31 và -181818/313131
-181818/313131= -181818:18/-313131:31=-18/31
=> -18/31 = -181818/-313131
\(-\frac{18}{31}=-\frac{18}{31}\)
\(-\frac{181818}{313131}=-\frac{18.10101}{31.10101}=-\frac{18}{31}\)
Do \(-\frac{18}{31}=-\frac{18}{31}\)
\(\Rightarrow-\frac{18}{31}=-\frac{181818}{313131}\)
ta có:
\(\frac{-181818}{313131}=\frac{-181818\div10101}{313131\div10101}=\frac{-18}{31}\)
Vậy \(\frac{-18}{31}=\frac{-181818}{313131}\)