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b=(2,6-2 1supra 3*6supra 7)*1 3 supra 7

Răspuns :

2intregi si 1/3*6/7=2intregi2/7=16/7
2,6=26/10=13/5
1intreg3/7=10/7
 Dupa calcule (13/5-16/7)*10/7=[(91-90)/35]*10/7=10/245.
Sper ca am inteles bine notatiile tale!