Răspuns :
(7-6+8)/9-4/7=9/9-4/7=1/1-4/7 (amplifici pe 1/1 cu 7)
7/7-4/7=(7-4)/7=3/7
7/7-4/7=(7-4)/7=3/7
exercitiul se ma poate scrie ...
...= (7- 6 + 8) / 9 - 4/7 = 9/9 - 4/7 = 1 - 4/7 = 7/7 - 4/7 = 3/7
...= (7- 6 + 8) / 9 - 4/7 = 9/9 - 4/7 = 1 - 4/7 = 7/7 - 4/7 = 3/7