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/ \
2 18
/ \
2 9
/ \
3 3
2²×3²
80
/ \
2 40
/ \
2 20
/ \
2 10
/ \
2 5
2⁴×5
FPB=2²=2×2=4
b.54
/ \
2 27
/ \
3 9
/ \
3 3
2×3³
120
/ \
2 60
/ \
2 30
/ \
2 15
/ \
3 5
2³×3×5
FPB=2×3=6