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72 = 2 × 2 × 2 × 3 ×3
104 = 2 × 2 × 2 × 13
FPB = 2 × 2 × 2 / 2³ = 8
: 56 72 104
-------------------------
(2) : 28 36 52
(2) : 14 18 26
(2) : 7 9 13
3 : - 3 -
3 : - 1 -
7 : 1 - -
13 : - - 1
2×2×2 = 8