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36/2
18/2
9/3
3/3
1. 72=2×2×2×3×3
48/2
24/2
12/2
6/2
3/3
1. 48=2×2×2×2×3
120/2
60/2
30/2
15/3
5/5
1. 120=2×2×2×3×5