Pregunta: Dados los siguientes grupos de fracciones, decir de cada fracción si es irreductible o no:1) ${3}/{6}$  y ${9}/{6}$  y ${9}/{9}$  
2) ${4}/{6}$  y ${3}/{3}$  y ${18}/{27}$  
3) ${4}/{7}$  y ${45}/{25}$  y ${64}/{24}$  
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