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Suma y resta de fracciones
Autor :
Ángel Martínez Recio
1.
Cacula 2/9 + 5/9
2.
Calcula 5/7 - 3/7
3.
Calcula 1/2 + 1/4
4.
Calcula 11/7 - 1/4
5.
Expresa como una fracción reducida 5/14 - 1/14