Question

mmc (16,18)

mmc (15,20)

Answer 1

16,18 =2
8,9=2
4,9=2
2,9=2
1,9=3
1,6=3 
1,3=3
1,1

espero ter ajudado

Answer 2

a)

16,18: 2
8,9: 2
4,9: 2
2,9: 2
1,9: 3
1,3: 3
1,1 = 2.2.2.2.3.3 = 16.9 = 144

R.: mmc (16,18) = 144
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b)

R.: mmc (15,20) = 60

15,20: 2
15,10: 2
15,5: 3
5,5: 5
1,1       = 2.2.3.5 = 4.15 = 60