Două posibilităţi cred că sunt de ajuns.
a) [tex] \frac{3}{8} = \frac{5}{8} - \frac{2}{8} [/tex]
[tex] \frac{3}{8} = \frac{6}{8} - \frac{3}{8} [/tex]
b) [tex] \frac{2}{7}= \frac{5}{7}- \frac{3}{7} [/tex]
[tex] \frac{2}{7}= \frac{10}{7}- \frac{8}{7} [/tex]
c) [tex] \frac{5}{9}= \frac{10}{9}- \frac{5}{9} [/tex]
[tex] \frac{5}{9}= \frac{8}{9}- \frac{3}{9} [/tex]
d) [tex] \frac{8}{12}= \frac{10}{12} - \frac{2}{12} [/tex]
[tex] \frac{8}{12}= \frac{9}{12} - \frac{1}{12} [/tex]
e) [tex] \frac{9}{21}= \frac{10}{12} - \frac{1}{12} [/tex]
[tex] \frac{9}{21}= \frac{14}{21} - \frac{5}{21} [/tex]
Sper că te-am ajutat! :)
