Răspunsuri

2014-03-18T07:07:47+02:00
Două posibilităţi cred că sunt de ajuns.
a)  \frac{3}{8} = \frac{5}{8} - \frac{2}{8}
     \frac{3}{8} = \frac{6}{8} - \frac{3}{8}
b)  \frac{2}{7}= \frac{5}{7}- \frac{3}{7}
     \frac{2}{7}= \frac{10}{7}- \frac{8}{7}
c)  \frac{5}{9}= \frac{10}{9}- \frac{5}{9}
     \frac{5}{9}= \frac{8}{9}- \frac{3}{9}
d)  \frac{8}{12}= \frac{10}{12}  - \frac{2}{12}
    \frac{8}{12}= \frac{9}{12}  - \frac{1}{12}
e)  \frac{9}{21}= \frac{10}{12}  - \frac{1}{12}
     \frac{9}{21}= \frac{14}{21}  - \frac{5}{21}
Sper că te-am ajutat! :)