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1 - 5/7 = 7/7 - 5/7 = 2/7
1 2/5 = 1 + 2/5 = 5/5 + 2/5 = 7/5
entonces:
(1 - 5/7) * 1 2/5 = (2/7) * (7/5)
= (2*7) / (7*5)
= 2/5
Respuesta:
2/5