pakek pohon faktor ya..

1. 5 = 5
9 = 3²
KPK = 3² x 5 = 45

2. 7 = 7
15 = 3 x 5
KPK = 3 x 5 x 7 = 105

3. 9 = 3²
13 = 13
KPK = 13 x 3² = 117

4. 12 = 2 x 3²
15 = 3 x 5
KPK = 2 x 3² x 5 = 60

5. 20 = 2² x 5
45 = 3² x 5
KPK = 2² x 3² x 5 = 180

Maaf cuma bisa bantu segini.. pohon faktor nya cari sendiri ya ^^