a)
[tex] \frac{23}{32} \frac{24}{42} \frac{25}{52} \frac{26}{62} \frac{27}{72} \frac{28}{82} \frac{29}{92} [/tex]
si
[tex] \frac{78}{87} \frac{79}{97} [/tex]
b)
[tex] \frac{31}{13} \frac{32}{23} [/tex]
[tex] \frac{51}{15} \frac{52}{25} \frac{53}{35} \frac{54}{45} [/tex]
c)
[tex] \frac{44}{47} \frac{46}{67} \frac{48}{87} [/tex]
d)
[tex] \frac{51}{19} \frac{53}{39}[/tex]
