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Răspuns:
12 |2 54|2
27|3
9|3
3|3
1
6|2
3|3
1
12=2²×3
54=2×3³
cmmdc = 2×3=6
42|2
21|3
7|7
1
42=2×3×7
54=2×3³
cmmdc=2×3=6