$${\displaystyle \underset{\text{■□■□■□}}{\overset{\text{■□■□■□}}{\square ■\square }}}$$

$\overline{\text{■□■□■□■□■□■□}}$

■□■□■□$lcm(a,b)=\frac{(ab)}{gcd(a,b)}$■□■□■□

■□■□■□$12345$■□■□■□

■□■□■□$12345$■□■□■□