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Faktor dari 189= 3×3×3×7=3³×7
KPK :
2²×3³×7=8×27×7
= 8×189
= 1.512
Jadi, KPK dari 72 dan 189 adalah 1.512
189 = 3³ x 7
kpk : 2³ x 3³ x 7
= 1.512