Resposta:
82/105
Explicação passo a passo:
2/3 - 3/5 + 5/7
MMC de 3 5 e 7
3 5 7 / 3
1 5 7 / 5
1 1 7 / 7
1 1 1
MMC = 105
105/3 = 35
35.2 = 70
105/5 = 21
21.3 = 63
105/7 = 15
15.5 = 75
70/105 - 63/105 + 75/105 =
