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Calculați

2/7+2/5+3/7+1/5+2/7+7/5


Răspuns :

2/7+2/5+3/7+1/5+2/7+7/5 =
=
2/7+3/7+2/7+2/5+1/5+7/5 =
=7/7+10/5 =1+2=3