Pregunta: Dados los siguientes grupos de fracciones, decir de cada fracción si es irreductible o no:1) ${3}/{6}$  y ${6}/{5}$  y ${5}/{20}$  
2) ${8}/{9}$  y ${4}/{8}$  y ${4}/{3}$  
3) ${6}/{6}$  y ${2}/{9}$  y ${8}/{8}$  
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