Question

El mcm de
4,3 y 5
7,9 y 21

Answer 1

$4 = {2}^{2} \\ 3 = 1 \times 3 \\ 5 = 1 \times 5 \\ M.C.M.(4,3,5) = {2}^{2} \times 3 \times 5 = 4 \times 3 \times 5 = 60$

$7 = 1 \times 7 \\ 9 = {3}^{2} \\ 21 = 3 \times 7 \\ M.C.M.(7,9,21) = {3}^{2} \times 7 = 9 \times 7 = 63$