Resposta :
1. MMC de 18 e 40:
18 = 2 * 3²
40 = 2³ * 5
MMC = 2³ * 3² * 5 = 360
2. MMC de 40 e 60:
40 = 2³ * 5
60 = 2² * 3 * 5
MMC = 2³ * 3 * 5 = 120
3. MMC de 6, 8 e 12:
6 = 2 * 3
8 = 2³
12 = 2² * 3
MMC = 2³ * 3 = 24
4. MMC de 10, 6, 4 e 8:
10 = 2 * 5
6 = 2 * 3
4 = 2²
8 = 2³
MMC = 2³ * 3 * 5 = 120