Calculati :
[tex] \frac{5}{9} + \frac{3}{9} = [/tex]
[tex] \frac{3}{7} + \frac{6}{7} = [/tex]
[tex] \frac{2}{4} + \frac{3}{4} = [/tex]


Răspuns :

5 / 9 + 3 / 9 = 8 / 9

3 / 7 + 6 / 7 = 9 / 7

2 / 4 + 3 / 4 = 5 / 4