Răspuns :
54 = 2 * 3 * 3 * 3 = 2 * 3³
63 = 3 * 3 * 7 = 3² * 7
72 = 2 * 2 * 2 * 3 * 3 = 2³ * 3³
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cmmdc = 3²
63 = 3 * 3 * 7 = 3² * 7
72 = 2 * 2 * 2 * 3 * 3 = 2³ * 3³
_______________________
cmmdc = 3²