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Efectuati urmatoarea scadere ;  1     -     1                                                                                 

                                                   2           7



Răspuns :

[tex] \frac{1}{2} [/tex] - [tex] \frac{1}{7} [/tex] = [tex] \frac{7}{14} [/tex] - [tex] \frac{2}{14} [/tex] = [tex] \frac{5}{14} [/tex]