a)
[tex]0,4(629)=\frac{4629-4}{9990} => \frac{4625}{9990} \\=> \frac{925}{1998} => \frac{25}{54}[/tex]
b)
[tex]0,2(407)=\frac{2407-2}{9990} =>\frac{2405}{9990}\\=>\frac{13}{54}[/tex]
c)
[tex]3,208(3)=\frac{32083-3208}{9000} =>\frac{28875}{9000} \\=>\frac{77}{24}[/tex]
d)
[tex]2,291(6)=\frac{22916-2291}{9000} =>\frac{20625}{9000} \\=> \frac{55}{24}[/tex]
Sper că ai înțeles!