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1/2+6/5-5/4
17/10-5/4
18/40
9/20
0,45
3/6 + 12/10 - 5/4 = Puedes simplificar 3/6 sacas tercera = 1/2 y 12/10
Saca mitad = 6/5
1/2 + 6/5 - 5/4 = Sacas el mcm de los denominadores 2 , 5 y 4 = 20
(1 * 10) + (6 * 4) - (5 * 5)
--------------------------------- =
20
10 + 24 - 25 34 - 25 9
----------------- = ------------ = --------
20 20 20
Respuesta.
9/20