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3/20 - 5/12 = Sacas el mcm de los denominadores 20 y 12
Descompones.
20 12 2(mitad)
10 6 2,,,,,,,,,,,,
5 3 3(tercera)
5 1 5(quinta)
1 1
El mcm de 20 y 12 = 2 * 2 * 3 * 5 = 60
3 5
---- - ------ =
20 12
(3 * 3) - (5 * 5)
-------------------- =
60
9 - 25 - 16
-------- = ---------- = Simplificas sacas cuarta
60 60
- 4
------
15
Respuesta.
- 4/15