18/12=3/2-(simplifica prin 6)
333/555=3/5-(simplifica prin 111)
2×5×7/3×5×21=224/5103=33/729=11/243-(simplifica prima data prin 7,a doua oara prin 3).
3^5×5^7×7^3/3^7×5^3×7^5=
243×78 125×343/2187×125×16807=
18984375×343/373375×16807=
6 511 640625/6 275 313 625=
1 302 328 125/1 255 062 725=
260 465 625/251 012 545=
52 093 125/50 202 509=
7 441 875/7 171 787=
1 063 125/1 024 541=151 875/146 363
De trei ori prin 5 si de 4 ori pri 7