Respuesta:
-3/20
Explicación paso a paso:
3/5 - [ 1/2 + ( 3/6 - 1/4 )] =
3/5 - [ 1/2 + (6/12 - 3/12)] =
3/5 - [ 1/2 + ( 3/12)] =
3/5 - [ 6/12+ 3/12 ] =
3/5 - [ 9/12 ] =
3/5 - [ 3/4 ] =
12/20 - 15/20 = -3/20
