son freacciones equivalentes
2/9+1/18
1/5+2/10
3/5-2/15
4/8+2/4
2/4+2/8
2/9+1/18
1/5+2/10
3/5-2/15
4/8+2/4
2/4+2/8
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Respuesta:
2/9+1/18
1/5+2/10
4/8+2/4