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2/6 - 1/6 = 1/6
1/6 - 1/4 =
2/12 - 3/12 = - 1/12
(1/3 - 1/6) - (1/6 - 1/4)
Resolvemos por separado y en cada paréntesis:
(6-3)/18 - (4-6)/24
3/18 - 2/24
Simplificando:
1/6 - 1/12
(12 - 6)/72
6/72
Simplificando: 1/12......es la respuesta