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1/4 + 2/5
Sacamos el mcm de los denominadores
4 - 5 l 2
2 - 5 l 2
1 - 5 l 5
1 - 1
El mcm es : 2 * 2 * 5 = 20
5 + 8 13
----------- = ------------
20 20
Solución :
13/20