Calcular el número que debe agregarse a los términos 2/7 para hacerla equivalente a 2/3
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7x3= 21
2/7= 6/21
2/3= 14/21
6/21 + 14/21 = 20/21 Falta 1/21
Sumando 2/7 + 1/21= 1/3 Falta 1/3
7/21 es el equivalente a 1/3
Entonces si sumamos 1/21 + 7/21 = 8/21
2/7 + 8/21 = 2/3
Respuesta:
Se le debe de agregar 8/21 a 2/7 para que sea equivalente a 2/3