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45 = 5X 3 kuadrat
81 = 9X3 kuadrat
kpk nya adalh
3 pangkat 3 X 5 X 9 = 1215
/\ /\ /\
3 9 3 15 3 27
/\ /\ /\
3 3 3 5 3 9
/\
3 3
faktorisasi prima:
27=3³
45=3² × 5
81=3⁴
kpk=3⁴ × 5 = 405