1, the rule of three-sided coloring obtained after cutting a large cube can basically be summarized as: there are several vertices, so there are several ones on three sides.

2. After the cube is cut, the sum of the number of small cubes drawn on both sides is the sum of the number of small cubes on each layer except the upper layer and the bottom layer. Formula: a=(n-2)* 12(n is the number of small cubes on each side of a big cube).

3. Formula for the number of blocks coated on one side: b = (n-2) 2 * 6.

4. After the big cube is cut, the number of small cubes without color on one side can be summarized as follows: the number of small cubes without color is the number of small cubes whose center moves from left, right, up and down. Formula: c = (n-3) 3