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./..\.........../..\.........../..\
2...9.........2..10.......2..20
..../..\............/..\........../..\
...3...3..........2...5.......2..10
...................................../..\
....................................2...5
18 = 2 × 3²
20 = 2² × 5
40 = 2³ × 5
KPK = 2³ × 3² × 5
KPK = 8 × 9 × 5
KPK = 360
18 20 40
2 9 10 20
2 9 5 10
2 9 5 5
3 3 5 5
3 1 5 5
5 1 5 5
kpk = 2*2*2*3*3*5 = 8*45 =360