1) 18= 3 × 3 × 2
250 = 5 × 5 × 5 × 2
3600 = 2 × 3 × 2 × 3 × 2 × 5 × 2 × 5
2) 108 sau 54
3) 13, 14
4)a × b = 72
a × c = 80
b× c = 90
a× b × a × c × b × c = 72 × 80 × 90
a^2 ×b^2×c^2= 518.400
a×b×c= radical 518.400
a×b×c = 720
c = 720 : 72 = 10
a = 80 : 10 = 8
b = 90 : 10 = 9
