Question

resolva : 2/3 - 3/5 - 5/7 = A) - 68/105 B) - 34/54 C) 25/64 D) - 6/9 E) 68/105

Answer 1

Resposta: A)-68/105

Explicação passo a passo:
3, 5, 7 |3
1, 5, 7  |5
1, 1, 7   |7
1, 1, 1

3x5x7=105

2/3  -  3/5   -   5/7
/105    /105     /105

105x2= 210

105x3= 315

105x5= 525

210/3=70

315/5=63

525/7=75

70/105 - 63/105 - 75/105 = -68/105