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efectueaza 3supra7+2supra7-4supra7=

Răspuns :

[tex] \frac{3}{7} + \frac{2}{7} - \frac{4}{7} = \frac{5}{7} - \frac{4}{7} = \frac{1}{7} [/tex]
3supra7+2supra7-4supra7=5upra7-4supra7=1supra7