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60 = 2(pangkat2) x 3 x 5
80 = 2(pangkat4) x - x 5
maka, FPB = 2(pangkat2) x 5
= 4 x 5
= 20
jadi, FPB dari 40, 60, dan 80 dalam bentuk faktorisasi prima = 2 x 2 x 5
faktorisasi primanya = 2(pangkat2) x 5
jawaban => B
2---------------------
20. 30. 40
2---------------------
10. 15. 20
5---------------------
2. 3. 4
jawabannya b. 2²×5