Primero debemos descomponer en factores primos cad npumero y luego calcular el mínimo común múltiplo (mcm) que está determinado por "la multiplicación de los factores comunes y no comunes con su máximo exponente"
1.
32 y 80
32 = 2 x 2 x 2 x 2 x 2 = <img src="https://tex.z-dn.net/?f=%202%5E%7B5%7D%20" />
80 = 2 x 2 x 2 x 2 x 5 = <img src="https://tex.z-dn.net/?f=%202%5E%7B4%7D%20x%205%20" />
mcm = <img src="https://tex.z-dn.net/?f=%202%5E%7B5%7D%20x%205%20" /> = 160
2.
24, 48, 56 y 168
24 = 2 x 2 x 2 x 3 = <img src="https://tex.z-dn.net/?f=%202%5E%7B3%7D%20x%203%20" />
48 = 2 x 2 x 2 x 2 x 3 = <img src="https://tex.z-dn.net/?f=%202%5E%7B4%7D%20x%203%20" />
56 = 2 x 2 x 2 x 7 = <img src="https://tex.z-dn.net/?f=%202%5E%7B3%7D%20x%207%20" />
168 = 2 x 2 x 2 x 3 x 7 = <img src="https://tex.z-dn.net/?f=%202%5E%7B3%7D%20x%203%20x%207" />
mcm = <img src="https://tex.z-dn.net/?f=%202%5E%7B4%7D%20x%203%20x%207" /> = 168
3.
18, 24 y 40
18 = 2 x 3 x 3 = <img src="https://tex.z-dn.net/?f=%202%20x%203%5E%7B2%7D%20" />
24 = 2 x 2 x 2 x 3 = <img src="https://tex.z-dn.net/?f=%202%5E%7B3%7D%20x%203%20" />
40 = 2 x 2 x 2 x 5 = [img = 10]
mcm = [img = 11] = 360
4.
32, 48 y 108
32 = 2 x 2 x 2 x 2 x 2 = [img = 12]
48 = 2 x 2 x 2 x 2 x 3 = [img = 13]
108 = 2 x 2 x 3 x 3 x 3 = [img = 14]
mcm = [img = 15] = 864
5.
2, 3, 6, 12 y 50
2 = 2
3 = 3
6 = 2 x 3
12 = 2 x 2 x 3 = [img = 16]
50 = 2 x 5 x 5 = [img = 17]
mcm = [img = 18] = 600
6.
100, 500, 700, y 1000
100 = 2 x 2 x 5 x 5 = [img = 19]
500 = 2 x 2 x 5 x 5 x 5 = [img = 20]
700 = 2 x 2 x 5 x 5 x 7 = [img = 21]
1000 = 2 x 2 x 2 x 5 x 5 x 5 = [img = 22]
mcm = [img = 23] = 7000
7.
14, 38, 56 y 114
14 = 2 x 7
38 = 2 x 19
56 = 2 x 2 x 2 x 7 = [img = 24]
114 = 2 x 3 x 19
mcm = [img = 25] = 3192
Saludos!