Le transformam in fractii, pe rand.
3,25=325/100=13/4
3,(25)=3 intregi 25/99=(3x99+25)/99=322/99
3,2(5)=3 intregi (25-2)/90=(3x90+23)/90=293/90
13/4 + 322/99 - 293/90=
Calculam numitorul comun :
4=2²
99=3²·11
90=2·3²·5
________
c.m.m.m.c.=2²·3²·5·11=1980 - numitorul comun
(13x495+322x20-293x22)/1980=
(6435+6440-6446)/1980=
6429/1980=
2143/660=
3,24(69)
