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3 + 4 1/2 =
3 + (4 * 2 + 1)/2
3 + (8 + 1)/2 =
3 + 9/2 =
3/1 + 9/2 =
(3 * 2)/2 + 9/2 =
6/2 + 9/2 =
(6 + 9)/2 =
15/2 =
7,5
Respuesta.
7,5kg