Put three identical cubes together to form a cuboid. The surface area of this cuboid is 504cm**2. What is the side length of a cube in centimeters?
把三个完全相同的正方体拼成一个长方体，这个长方体的表面积是504cm**2．一个正方体的棱长是多少厘米？
<result>6</result>