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Calculati in 2 moduri:
3x2supra7+2supra7


Răspuns :

3 x 2/7 + 2/7 = 2/7 ( 3+1) = 2/7 x 4 = 8/7 

3 x 2/7 + 2/7 = 6/7 + 2/7 = 8/7