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72 = 2³ × 3²
90 = 2 × 3² × 5
KPK = 3² × 2³ × 5
= 9 × 8 × 5
= 21
faktorisasi prima 45 = 3²×5
faktorisasi prima 72 = 2³×3²
faktorisasi prima 90 = 2×3²×5
Jadi KPK = 3²×2³ =72