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2/5 - (5/8 - 3/4)
2/5 - (5/8 - ((3*2)/(4 *2)) =
2/5 - (5/8 - 6/8) =
2/5 - (- 1/8) = Para quitar parentesis aplicas ley de signos - por - = +
2/5 + 1/8 =
(2*8)/(5*8) + (5 * 1)/(8 * 5) =
16/40 + 5/40 =
(16 + 5)/40 =
21/40
Respuesta.
21/40