Răspuns :

Mariadragne28id

18=2*3²

15=3*5

20=2²*5

2²*3²*5

4*9*5

36*5

180

Crys157724id

descompunem nr in factori primi :

15 = 3 × 5

20 = 2^2 × 5

18 = 2 × 3^2

cmmmc [ 15, 20, 18 ] = 2^2 × 3^2 × 5 = 4 × 9 × 5 = 180

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