5 pe 7 plus 2 septimi minos 6 optimi

Răspuns :

5/7 +2/7 -6/8
7/7 -6/8
1- 6/8
8/8-6/8
2/8
1/4
Raspunsul e 1/4
5/7 + 2/7 - 6/8 = 7/7 - 6/8 = 1 - 6/8 = 2/8 = 1/4