Hola chechenca!
a) MÇM--------------------ĐÇM
•84/2-----------------------•72/2
-42/2------------------------36/2
-21/3-------------------------18/2
--7/7--------------------------9/3
---1----------------------------3/3
---------------------------------1
84 = 2^2x3x7-------------72 = 2^2x3^2
dcm(84,72) = 2^2x3 = 12
mcm(84,72) = 2^2x3^2x7 = 252
La otra no la c, lo siento
Espero q te ayude, ten lindo dia ❣
Cuidate.