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Efectuati calculele:11 supra 21 +9 supra 21

Răspuns :

11/21+9/21=20/21 ( am citit prima oara 21+9 )
[tex] \frac{11}{21} + \frac{9}{21} = \frac{11+9}{21} = \frac{20}{21} [/tex]